Add toggle for favorites in create_root_dialog.

editor/create_dialog.h

@@ -90,6 +90,8 @@ protected:
 	void _notification(int p_what);
 	static void _bind_methods();
 
+	void _save_and_update_favorite_list();
+
 public:
 	Object *instance_selected();
 	String get_selected_type();