Complex rigs are built from many bones (often overlapping)
connected by constraints.
When investigating or debugging such rigs one often wants to switch to
the target of a constraint, or a parent bone, but it is difficult to do
manually due to overlap confusion.
This adds a right click menu option that automatically selects
and makes the target object or bone active for UI fields where a
suitable reference is readily available.
* Move Add to Quick Favorites before Assign Shortcut, as it is more often
that we add items to favorites, than changing shortcuts.
* Move Header menu last. In some cases the Online Manual for that item
would appear after the header menu.
* No icon for "Remove from Quick Favorites", matches Remove Shortcut
* 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.
