Added OwnerLostAction

Allows customisation of what will happen to an actor when its owner
loses.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -51,7 +51,8 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new AddShakeToBridge(),
 				new AddEditorPlayer(),
 				new RemovePaletteFromCurrentTileset(),
-				new DefineLocomotors()
+				new DefineLocomotors(),
+				new DefineOwnerLostAction()
 			})
 		};