Add C-b g , and C-b g . for move and resize menus, also add to pane menu

(and fix to make them work).

tmux.h

@@ -2268,6 +2268,9 @@ struct client {
 	void			*overlay_data;
 	struct event		 overlay_timer;
 
+	u_int			 menu_last_px;
+	u_int			 menu_last_py;
+
 	struct client_files	 files;
 	u_int			 source_file_depth;