* Add Shortcut -> Assign Shortcut
* Add to Favorites Menu -> Add to Quick Favorites
To match the menu name and be more general for when the Quick Favorites
are accessible in places other than just menus (like panels).
Add blank icon to Remove Shortcut so it aligns with Change Shortcut
which is usually the item on top of it in the menu.
- Use per context menu lists to support menu editing.
- Support for different kinds of menu items since this may be needed
in the future. Only use operator types for now.