Added first sound effect, and sound effect volume control settings

As of now, every single button in the game has the same click sound, but that will change

Credits.md

@@ -389,3 +389,10 @@ All the following are from [the Noun Project](https://thenounproject.com) licenc
 * [Replace](https://thenounproject.com/search/?q=replace&i=17858) By Mike Rowe, AU
 * [Resistance](https://thenounproject.com/term/revolution/1315305/) By By HeadsOfBirds, GB 
 
+
+# Sound credits
+
+Sounds are from FreeSound.org
+
+* [Click 01_Minimal UI Sounds](https://freesound.org/people/cabled_mess/sounds/370962/) By cabled_mess  for most clicks
+* [SawInOut01](https://freesound.org/people/kingof_thelab/sounds/340243/) By kingof_thelab for construction picking?

core/src/com/unciv/GameSettings.kt

@@ -9,6 +9,7 @@ class GameSettings {
     var resolution: String = "1050x700"
     var tutorialsShown = ArrayList<String>()
     var hasCrashedRecently = false
+    var soundEffectsVolume = 1.0f
 
     fun save(){
         GameSaver().setGeneralSettings(this)

core/src/com/unciv/ui/utils/CameraStageBaseScreen.kt

@@ -122,9 +122,11 @@ fun Label.setFontSize(size:Int): Label {
     return this // for chaining
 }
 
+// If there are other buttons that require special clicks then we'll have an onclick that will accept a string parameter, no worries
 fun Actor.onClick(function: () -> Unit) {
     this.addListener(object : ClickListener() {
         override fun clicked(event: InputEvent?, x: Float, y: Float) {
+            Sounds.play("click")
             function()
         }
     } )

core/src/com/unciv/ui/utils/ImageGetter.kt

@@ -190,4 +190,5 @@ object ImageGetter {
 
         return line
     }
-}
+}
+

core/src/com/unciv/ui/utils/Sounds.kt

@@ -0,0 +1,20 @@
+package com.unciv.ui.utils
+
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.audio.Sound
+import com.unciv.UnCivGame
+
+object Sounds{
+    val soundMap = HashMap<String, Sound>()
+
+    fun get(name:String):Sound{
+        if(!soundMap.containsKey(name))
+            soundMap[name] = Gdx.audio.newSound(Gdx.files.internal("sounds/$name.mp3"));
+        return soundMap[name]!!
+    }
+
+
+    fun play(name:String){
+        get(name).play(UnCivGame.Current.settings.soundEffectsVolume)
+    }
+}

core/src/com/unciv/ui/worldscreen/TileMapHolder.kt

@@ -93,20 +93,20 @@ class TileMapHolder(internal val worldScreen: WorldScreen, internal val tileMap:
         })
     }
 
-    private fun onTileClicked(tileInfo: TileInfo, tileGroup: WorldTileGroup){
-            worldScreen.displayTutorials("TileClicked")
-            if (moveToOverlay != null) moveToOverlay!!.remove()
-            selectedTile = tileInfo
+    private fun onTileClicked(tileInfo: TileInfo, tileGroup: WorldTileGroup) {
+        worldScreen.displayTutorials("TileClicked")
+        if (moveToOverlay != null) moveToOverlay!!.remove()
+        selectedTile = tileInfo
 
-            val selectedUnit = worldScreen.bottomBar.unitTable.selectedUnit
-            if (selectedUnit != null && selectedUnit.getTile() != tileInfo
-                    && selectedUnit.canMoveTo(tileInfo) && selectedUnit.movementAlgs().canReach(tileInfo)) {
-                // this can take a long time, because of the unit-to-tile calculation needed, so we put it in a different thread
-                queueAddMoveHereButton(selectedUnit, tileInfo)
-            }
+        val selectedUnit = worldScreen.bottomBar.unitTable.selectedUnit
+        if (selectedUnit != null && selectedUnit.getTile() != tileInfo
+                && selectedUnit.canMoveTo(tileInfo) && selectedUnit.movementAlgs().canReach(tileInfo)) {
+            // this can take a long time, because of the unit-to-tile calculation needed, so we put it in a different thread
+            queueAddMoveHereButton(selectedUnit, tileInfo)
+        }
 
-            worldScreen.bottomBar.unitTable.tileSelected(tileInfo)
-            worldScreen.shouldUpdate=true
+        worldScreen.bottomBar.unitTable.tileSelected(tileInfo)
+        worldScreen.shouldUpdate = true
     }
 
     private fun queueAddMoveHereButton(selectedUnit: MapUnit, tileInfo: TileInfo) {

core/src/com/unciv/ui/worldscreen/optionstable/WorldScreenDisplayOptionsTable.kt

@@ -5,13 +5,17 @@ import com.badlogic.gdx.graphics.g2d.Batch
 import com.badlogic.gdx.scenes.scene2d.Actor
 import com.badlogic.gdx.scenes.scene2d.ui.Label
 import com.badlogic.gdx.scenes.scene2d.ui.SelectBox
+import com.badlogic.gdx.scenes.scene2d.ui.Slider
 import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener
+import com.badlogic.gdx.utils.Array
 import com.unciv.UnCivGame
 import com.unciv.models.gamebasics.GameBasics
 import com.unciv.ui.utils.CameraStageBaseScreen
 import com.unciv.ui.utils.Fonts
+import com.unciv.ui.utils.Sounds
 import com.unciv.ui.utils.center
 import com.unciv.ui.worldscreen.WorldScreen
+import kotlin.concurrent.thread
 
 class Language(val language:String){
     val percentComplete:Int
@@ -27,7 +31,7 @@ class Language(val language:String){
 }
 
 class WorldScreenDisplayOptionsTable : PopupTable(){
-    val languageSelectBox = SelectBox<Language>(CameraStageBaseScreen.skin)
+    val languageSelectBox = SelectBox<Language>(skin)
 
     init {
         update()
@@ -48,55 +52,9 @@ class WorldScreenDisplayOptionsTable : PopupTable(){
         else addButton("{Show} {resources and improvements}") { settings.showResourcesAndImprovements = true; update() }
 
 
-        val languageArray = com.badlogic.gdx.utils.Array<Language>()
-        GameBasics.Translations.getLanguages().map { Language(it) }.sortedByDescending { it.percentComplete }
-                .forEach { languageArray.add(it) }
-        languageSelectBox.items = languageArray
-        languageSelectBox.selected = languageArray.first { it.language== UnCivGame.Current.settings.language}
-        add(languageSelectBox).pad(10f).row()
+        addLanguageSelectBox()
 
-        languageSelectBox.addListener(object : ChangeListener() {
-            override fun changed(event: ChangeEvent?, actor: Actor?) {
-                val selectedLanguage = languageSelectBox.selected.language
-                if (Fonts().containsFont(Fonts().getFontForLanguage(selectedLanguage)))
-                    selectLanguage()
-                else {
-                    val spaceSplitLang = selectedLanguage.replace("_"," ")
-                    YesNoPopupTable("This language requires you to download fonts.\n" +
-                            "Do you want to download fonts for $spaceSplitLang?",
-                            {
-
-                                val downloading = PopupTable()
-                                downloading.add(Label("Downloading...", CameraStageBaseScreen.skin))
-                                downloading.pack()
-                                downloading.center(stage)
-                                stage.addActor(downloading)
-                                Gdx.input.inputProcessor = null // no interaction until download is over
-
-                                kotlin.concurrent.thread {
-                                    Fonts().downloadFontForLanguage(selectedLanguage)
-                                    // The language selection must be done on the render thread, because it requires a GL context.
-                                    // This means that we have to tell the table to create it on render.
-                                    shouldSelectLanguage=true
-                                }
-
-                            })
-                }
-            }
-        })
-
-        if(languageSelectBox.selected.percentComplete!=100) {
-            add(Label("Missing translations:", CameraStageBaseScreen.skin)).pad(5f).row()
-            val missingTextSelectBox = SelectBox<String>(CameraStageBaseScreen.skin)
-            val missingTextArray = com.badlogic.gdx.utils.Array<String>()
-            val currentLanguage = UnCivGame.Current.settings.language
-            GameBasics.Translations.filter { !it.value.containsKey(currentLanguage) }.forEach { missingTextArray.add(it.key) }
-            missingTextSelectBox.items = missingTextArray
-            missingTextSelectBox.selected = "Untranslated texts"
-            add(missingTextSelectBox).pad(10f).width(UnCivGame.Current.worldScreen.stage.width / 2).row()
-        }
-
-        val resolutionSelectBox= SelectBox<String>(CameraStageBaseScreen.skin)
+        val resolutionSelectBox= SelectBox<String>(skin)
         val resolutionArray = com.badlogic.gdx.utils.Array<String>()
         resolutionArray.addAll("900x600","1050x700","1200x800","1500x1000")
         resolutionSelectBox.items = resolutionArray
@@ -113,6 +71,18 @@ class WorldScreenDisplayOptionsTable : PopupTable(){
             }
         })
 
+        val soundEffectsVolumeSlider = Slider(0f,1.0f,0.1f,false,skin)
+        soundEffectsVolumeSlider.value = UnCivGame.Current.settings.soundEffectsVolume
+        soundEffectsVolumeSlider.addListener(object: ChangeListener(){
+            override fun changed(event: ChangeEvent?, actor: Actor?) {
+                UnCivGame.Current.settings.soundEffectsVolume= soundEffectsVolumeSlider.value
+                UnCivGame.Current.settings.save()
+                Sounds.play("click")
+            }
+        })
+        add("Sound effects volume").row()
+        add(soundEffectsVolumeSlider).row()
+
         addButton("Close"){ remove() }
 
         pack() // Needed to show the background.
@@ -120,6 +90,56 @@ class WorldScreenDisplayOptionsTable : PopupTable(){
         UnCivGame.Current.worldScreen.shouldUpdate=true
     }
 
+    private fun addLanguageSelectBox() {
+        val languageArray = Array<Language>()
+        GameBasics.Translations.getLanguages().map { Language(it) }.sortedByDescending { it.percentComplete }
+                .forEach { languageArray.add(it) }
+        languageSelectBox.items = languageArray
+        languageSelectBox.selected = languageArray.first { it.language == UnCivGame.Current.settings.language }
+        add(languageSelectBox).pad(10f).row()
+
+        languageSelectBox.addListener(object : ChangeListener() {
+            override fun changed(event: ChangeEvent?, actor: Actor?) {
+                val selectedLanguage = languageSelectBox.selected.language
+                if (Fonts().containsFont(Fonts().getFontForLanguage(selectedLanguage)))
+                    selectLanguage()
+                else {
+                    val spaceSplitLang = selectedLanguage.replace("_", " ")
+                    YesNoPopupTable("This language requires you to download fonts.\n" +
+                            "Do you want to download fonts for $spaceSplitLang?",
+                            {
+
+                                val downloading = PopupTable()
+                                downloading.add(Label("Downloading...", skin))
+                                downloading.pack()
+                                downloading.center(stage)
+                                stage.addActor(downloading)
+                                Gdx.input.inputProcessor = null // no interaction until download is over
+
+                                thread {
+                                    Fonts().downloadFontForLanguage(selectedLanguage)
+                                    // The language selection must be done on the render thread, because it requires a GL context.
+                                    // This means that we have to tell the table to create it on render.
+                                    shouldSelectLanguage = true
+                                }
+
+                            })
+                }
+            }
+        })
+
+        if (languageSelectBox.selected.percentComplete != 100) {
+            add(Label("Missing translations:", skin)).pad(5f).row()
+            val missingTextSelectBox = SelectBox<String>(skin)
+            val missingTextArray = Array<String>()
+            val currentLanguage = UnCivGame.Current.settings.language
+            GameBasics.Translations.filter { !it.value.containsKey(currentLanguage) }.forEach { missingTextArray.add(it.key) }
+            missingTextSelectBox.items = missingTextArray
+            missingTextSelectBox.selected = "Untranslated texts"
+            add(missingTextSelectBox).pad(10f).width(UnCivGame.Current.worldScreen.stage.width / 2).row()
+        }
+    }
+
 
     fun selectLanguage(){
         UnCivGame.Current.settings.language = languageSelectBox.selected.language