Add "Improvement" as an improvement filter (#9906)

* Add "Improvement" as an improvement filter

* Update docs, change from non road improvement to all improvement

core/src/com/unciv/models/ruleset/tile/TileImprovement.kt

@@ -26,7 +26,7 @@ class TileImprovement : RulesetStatsObject() {
     override fun getUniqueTarget() = UniqueTarget.Improvement
     val shortcutKey: Char? = null
     // This is the base cost. A cost of 0 means created instead of buildable.
-    val turnsToBuild: Int = -1
+    var turnsToBuild: Int = -1
 
 
     fun getTurnsToBuild(civInfo: Civilization, unit: MapUnit): Int {
@@ -89,6 +89,7 @@ class TileImprovement : RulesetStatsObject() {
         return when (filter) {
             name -> true
             "All" -> true
+            "Improvement" -> true // For situations involing tileFilter
             "All Road" -> isRoad()
             "Great Improvement", "Great" -> isGreatImprovement()
             in uniqueMap -> true

docs/Modders/Unique-parameters.md

@@ -93,6 +93,7 @@ cityFilters allow us to choose the range of cities affected by this unique:
 -   `in non-enemy foreign cities` - In all cities owned by civs other than you that you are not at war with
 -   `in foreign cities`
 -   `in annexed cities`
+-   `in puppeted cities`
 -   `in holy cities`
 -   `in City-State cities`
 -   `in cities following this religion` - Should only be used in pantheon/follower uniques for religions
@@ -192,9 +193,10 @@ So for instance, the unique "[stats] from [tileFilter] tiles [cityFilter]" can m
 ## tileFilter
 
 Any of:
-- [terrainFilter](#terrainfilter) for this tile
-- [improvementFilter](#improvementfilter) for this tile
-- `unimproved' if no improvement exists
+-   [terrainFilter](#terrainfilter) for this tile
+-   [improvementFilter](#improvementfilter) for this tile
+-   `Improvement` for all improvements
+-   `unimproved` if no improvement exists
 
 ## terrainQuality