Add EditorPlayer to all mods

To prevent the editor from loading unnecessary or even incompatible
player traits.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -45,7 +45,8 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new DefineSoundDefaults(),
 				new RenameWormSpawner(),
 				new RemoveWithReloadingSpriteTurret(),
-				new IgnoreAbstractActors()
+				new IgnoreAbstractActors(),
+				new AddEditorPlayer()
 			})
 		};