0.2.1

1. Fix plugin update check.
2. Remove track/queue duration sleep timers, and replace with option to use remaining duration of current track.
3. Remove swipe to change views; buggy, and material apps don't do this.
4. Fix deleting playlists.
5. Center crop background image in mobile now playing info.
6. Don't add play actions to toolbar for track/album/atist info.
7. Fix buttons in fullscreen image view.
8. Remove option to sort favourites, instead allow drag'n'drop re-ordering.
9. Don't allow pining of favourites - their IDs seem to change too, and why pin a favourite directly?
10. Always use player's current cover image for now playing.
11. Use album artist for album review.
12. Fix player menu in manage players dialog not always showing.