Bit of a megapatch that:
- Adds dedicated play, shuffle, and view items to all item menus
(songs haven't been fully implemented yet)
- Adds icons to all item menus
- Re-adds enabled/disabled items to menus
- Makes menu action naming conventions more consistent with the rest
of the app
Add a dialog that shows menu information as a bottom sheet instead of as
a PopupMenu.
This did not take as much finessing of BottomSheetBehavior as the main
playback UI framework did, just some style redefinitions.