Add the world components of the new editor.

OpenRA.Game/Map/ActorReference.cs

@@ -48,7 +48,7 @@ namespace OpenRA
 			return info;
 		}
 
-		public MiniYaml Save()
+		public MiniYaml Save(Func<object, bool> initFilter = null)
 		{
 			var ret = new MiniYaml(Type);
 			foreach (var init in InitDict)
@@ -56,6 +56,9 @@ namespace OpenRA
 				if (init is ISuppressInitExport)
 					continue;
 
+				if (initFilter != null && !initFilter(init))
+					continue;
+
 				var initName = init.GetType().Name;
 				ret.Nodes.Add(new MiniYamlNode(initName.Substring(0, initName.Length - 4), FieldSaver.Save(init)));
 			}