Remove unused method and property

src/js/game/building_codes.js

@@ -12,8 +12,7 @@ import { Vector } from "../core/vector";
  *   rotationVariant?: number,
  *   tileSize?: Vector,
  *   sprite?: AtlasSprite,
- *   blueprintSprite?: AtlasSprite,
- *   silhouetteColor?: string
+ *   blueprintSprite?: AtlasSprite
  * }} BuildingVariantIdentifier
  */
 

src/js/game/components/static_map_entity.js

@@ -47,14 +47,6 @@ export class StaticMapEntityComponent extends Component {
         return getBuildingDataFromCode(this.code).blueprintSprite;
     }
 
-    /**
-     * Returns the silhouette color
-     * @returns {string}
-     */
-    getSilhouetteColor() {
-        return getBuildingDataFromCode(this.code).silhouetteColor;
-    }
-
     /**
      * Returns the meta building
      * @returns {import("../meta_building").MetaBuilding}