Made water oil wells require the Refrigeration tech (#4889)

* Made water oil wells require the Refrigeration tech

Oil wells can now only be created on water with the refrigeration
technology.

This is not the ideal solution: it would be preferable to support
multiple improvements for a single resource, to add offshore platforms
as a separate improvement for coastal oil that requires refrigeration
and to disable building oil wells on coast. Allowing multiple
improvements for a resource would however be a much more significant
refactor.

* Added back "terrainsCanBeBuiltOn": ["Coast"]

android/assets/jsons/Civ V - Vanilla/TileImprovements.json

@@ -52,6 +52,7 @@
 		"terrainsCanBeBuiltOn": ["Coast"],
 		"turnsToBuild": 9,
 		"techRequired": "Biology",
+		"uniques": ["Cannot be built on [Coast] tiles until [Refrigeration] is discovered"],
 		"shortcutKey": "W"
 	},
 	{

core/src/com/unciv/logic/map/TileInfo.kt

@@ -387,6 +387,10 @@ open class TileInfo {
             improvement.uniqueObjects.any {
                 it.placeholderText == "Obsolete with []" && civInfo.tech.isResearched(it.params[0])
             } -> return false
+            improvement.uniqueObjects.any {
+                it.placeholderText == "Cannot be built on [] tiles until [] is discovered" &&
+                matchesTerrainFilter(it.params[0]) && !civInfo.tech.isResearched(it.params[1])
+            } -> false
             else -> canImprovementBeBuiltHere(improvement, hasViewableResource(civInfo))
         }
     }