Add MovedToNewCapital buiding unique (#11213)

* Added MovedToNewCapital building unique

Yet to be tested

* Applied the suggestions

Of @yairm210 and @SomeTroglodyte

core/src/com/unciv/logic/civilization/Civilization.kt

@@ -866,6 +866,22 @@ class Civilization : IsPartOfGameInfoSerialization {
             // move new capital
             city.cityConstructions.addBuilding(city.capitalCityIndicator())
             city.isBeingRazed = false // stop razing the new capital if it was being razed
+
+            // move the buildings with MovedToNewCapital unique
+            if (oldCapital != null) {
+                // Get the Set of the buildings to move
+                val buildingsToMove = oldCapital.cityConstructions.getBuiltBuildings().filter {
+                    it.hasUnique(UniqueType.MovesToNewCapital)
+                }.toSet()
+
+                // Remove the buildings from old capital
+                oldCapital.cityConstructions.removeBuildings(buildingsToMove)
+
+                // Add the buildings to new capital
+                buildingsToMove.forEach {
+                    city.cityConstructions.addBuilding(it)
+                }
+            }
         }
         oldCapital?.cityConstructions?.removeBuilding(oldCapital.capitalCityIndicator())
     }

core/src/com/unciv/models/ruleset/unique/UniqueType.kt

@@ -305,6 +305,7 @@ enum class UniqueType(
     Unsellable("Unsellable", UniqueTarget.Building),
     ObsoleteWith("Obsolete with [tech]", UniqueTarget.Building, UniqueTarget.Resource, UniqueTarget.Improvement),
     IndicatesCapital("Indicates the capital city", UniqueTarget.Building),
+    MovesToNewCapital("Moves to new capital when capital changes", UniqueTarget.Building),
     ProvidesExtraLuxuryFromCityResources("Provides 1 extra copy of each improved luxury resource near this City", UniqueTarget.Building),
 
     DestroyedWhenCityCaptured("Destroyed when the city is captured", UniqueTarget.Building),

docs/Modders/uniques.md

@@ -1126,6 +1126,9 @@ Simple unique parameters are explained by mouseover. Complex parameters are expl
 ??? example  "Indicates the capital city"
 	Applicable to: Building
 
+??? example  "Moved to the new capital"
+	Applicable to: Building
+
 ??? example  "Provides 1 extra copy of each improved luxury resource near this City"
 	Applicable to: Building