Add decorative civilian buildings to random maps

Allows the random map generator to optionally place civilian buildings
around the map for extra decoration. Buildings are placed last with
lowest priority to avoid competing for play area and resources.

Depends on #21738

mods/ra/rules/map-generators.yaml

@@ -9,6 +9,7 @@
 						TerrainFeatureSize: 20480
 						ForestFeatureSize: 20480
 						ResourceFeatureSize: 20480
+						CivilianBuildingsFeatureSize: 10240
 						Water: 200
 						Mountains: 100
 						Forests: 25
@@ -47,6 +48,9 @@
 						MaximumExpansionSize: 12
 						ExpansionInner: 2
 						ExpansionBorder: 1
+						CivilianBuildings: 125
+						MinimumCivilianBuildingDensity: 50
+						CivilianBuildingDensityRadius: 6
 						DefaultResource: Ore
 						ResourceSpawnSeeds:
 							mine: Ore
@@ -64,6 +68,7 @@
 						RoadSegmentTypes: Road,RoadIn,RoadOut
 						ForestObstacles: Trees
 						UnplayableObstacles: Obstructions
+						CivilianBuildingsObstacles: CivilianBuildings
 			Option@hidden_tileset_overrides:
 				Choice@desert:
 					Tileset: DESERT
@@ -109,11 +114,13 @@
 					Label: label-ra-map-generator-choice-terrain-type-plains
 					Settings:
 						Water: 0
+						CivilianBuildings: 100
 				Choice@Parks:
 					Label: label-ra-map-generator-choice-terrain-type-parks
 					Settings:
 						Water: 0
 						Forests: 100
+						CivilianBuildings: 100
 				Choice@Woodlands:
 					Label: label-ra-map-generator-choice-terrain-type-woodlands
 					Settings:
@@ -173,6 +180,7 @@
 					Settings:
 						Water: 500
 						TerrainFeatureSize: 102400
+						CivilianBuildings: 256
 				Choice@Wetlands:
 					Label: label-ra-map-generator-choice-terrain-type-wetlands
 					Settings:
@@ -387,6 +395,37 @@
 				Checkbox: Roads
 				Default: True
 				Priority: 1
+			Option@CivilianDensity:
+				Label: label-ra-map-generator-option-civilian-density
+				Default: Default
+				Priority: 3
+				Choice@Default:
+					Label: label-ra-map-generator-choice-civilian-density-default
+					Settings:
+				Choice@None:
+					Label: label-ra-map-generator-choice-civilian-density-none
+					Settings:
+						CivilianBuildings: 0
+				Choice@Low:
+					Label: label-ra-map-generator-choice-civilian-density-low
+					Settings:
+						CivilianBuildings: 75
+				Choice@Medium:
+					Label: label-ra-map-generator-choice-civilian-density-medium
+					Settings:
+						CivilianBuildings: 125
+				Choice@High:
+					Label: label-ra-map-generator-choice-civilian-density-high
+					Settings:
+						CivilianBuildings: 250
+				Choice@VeryHigh:
+					Label: label-ra-map-generator-choice-civilian-density-very-high
+					Settings:
+						CivilianBuildings: 500
+				Choice@Max:
+					Label: label-ra-map-generator-choice-civilian-density-max
+					Settings:
+						CivilianBuildings: 1000
 	ClearMapGenerator@clear:
 		Type: clear
 		Name: map-generator-clear