global menu 0.6 in action:
o Activating menu item
o Changing Menu item title on the fly.
o Add/Remove menu item and submenu
o Show/Hide menu item
o Application quiting notification.
+ enable/disable menu item
+ creating and disposing document window and menu.
+ quiting the application
todo:
3. central service
4. manager
5. map the model to Gtk
6. patch GTK
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