Add play and shuffle options for all song menus.
These will override the shuffle state, unlike other song play
interactions.
This required a good bit of refactoring to menu, some of which
might be ported to other commands in future changes.
Use the new menu system in all applicable places.
More consideration is needed right now on whether the toolbars should
also have menu items, so they remain unchanged right now.
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.
Flatten the navigation graph into a single "main" graph that links
home to both explore and preference fragments.
***This massively breaks the app in it's current state***. Further
changes and refactors are needed to get this back to working.
