Add clear menu entries for extending and replacing scripts

editor/property_editor.h

@@ -77,7 +77,8 @@ class CustomPropertyEditor : public Popup {
 		OBJ_MENU_COPY = 4,
 		OBJ_MENU_PASTE = 5,
 		OBJ_MENU_NEW_SCRIPT = 6,
-		OBJ_MENU_SHOW_IN_FILE_SYSTEM = 7,
+		OBJ_MENU_EXTEND_SCRIPT = 7,
+		OBJ_MENU_SHOW_IN_FILE_SYSTEM = 8,
 		TYPE_BASE_ID = 100,
 		CONVERT_BASE_ID = 1000
 	};