4.0.2

1. Respect LMS's setting to not group by release type.
2. Add jumplist support when showing multiple release types.
3. Don't highlight active jumplist item.
4. Remove option for letter overlay whilst scrolling.
5. Fix reading some LMS prefs where LMS returns '?'.
6. Only request artist_ids when searching if LMS 8.4 or newer.
7. Allow user-supplied backdrops, by placing into prefs/material-skin/backdrops
8. Query LMS for release type names.
9. Fix play button showing in mobile layout when no tracks in queue.
10. Remove link to user guide, its out of date.
11. Adjust volume with arrow keys, if control has focus.
12. 'Pulse' now-playing cover menu button if cover clicked.
13. Add native callback for titlebar and window control buttons, mainly for use in next version of Melodeon.
14. When using album style highlight all tracks of current album.
15. Clear queue selection when activate certain menu items.
16. Show menu buttons for tracks in browse and queue views when some are selected.
17. Remove hack to place 'Manage plugins' first in list, as LMS 8.4 now has a proper fix for this.
18. Fix browse toolbar if have selection.