Add application singleton
Use application singleton to avoid crashing
Use the application singleton a lot more
Make AlbumsFragment use the albumartist tag as set in the options
The preference for album grid decides if it should be a list or a grid. No more cache based decision.

We can't detect MPD's version to decide if we can show the grid since we're probably not connected yet.
Add album grouping support on MPD 0.19
Fix wrong attributes set. Still not everything working
Fix album details listing adding useless albumartist parameter. If album listing regresses, REVERT THIS
Use albumartist only for MPD 0.19+ album listing. It's the only setting that makes sense anyway.
Add a way to log every sent mpd command (disabled by default, BuildConfig.DEBUG does not work in libraries)