- Covers: improve performance & reduce ANRs probability.
  Note: the mechanism to retrieve music had to be changed.
  This means loved songs will be lost. I'm sorry :)

- Improve filter opt.
- Improve swiping
- Improve songs visualization opt.
- Fix sorting
- Fix add album to queue
- Lollipop: fix Now Playing's seekbar
- Many other bug fixes and improvements
- Music tab: show no. of songs
- Update translations