Log Message:
Update rhythmbox-gtk3 to 3.0.1

Highlights:
* Plugins now use Python 3
* New task progress display below the track list
  (used for various things including track transfers and
   import jobs)
* Support for composer tags
* Restyled playback controls
* Restyled source list using symbolic icons
* Better introspection of everything
* Separate CBR and VBR encoding styles with different sets
  of exposed properties
* Playlist settings (browser visibility etc.) saved in
  playlists.xml
* Better use of RTL icons where appropriate

For full release notes see:
https://git.gnome.org/browse/rhythmbox/tree/NEWS?id=v3.0.1