[gnome-music] (21 commits) Non-fast-forward update to branch wip/jfelder/playlists-core-rewrite-prep-work

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/playlists-core-rewrite-prep-work' was changed in a way that was not a fast-forward 
update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c8e9cc2... playlistsview: Remove unused attribute _current_playlist_in
  cc25dea... playlists: Remove unused signal song-removed-from-playlist
  6ca1e76... playlists: Manage playlists deletion list internally
  6eff9f5... playlists: Make Playlist a GObject subclass
  a2b25d1... playlists: Add missing __repr__ method to Playlist class
  4a8ab62... playlists: Turn python-specific fields into GObject propert
  2eb68ea... playlists: Dynamically instantiate the smart playlists
  1d166cd... playlists: Add is_smart property to Playlist
  23d3bec... playlists: Add a SmartPlaylist class
  b0b849e... playlists: Manage playlists internally
  a1947ff... playlists: Sort playlists
  fc5fb58... playlistdialog: Use the playlists managed by Playlists
  e02106c... playlists: Introduce a ready property
  887f30f... playlistsview: Move playlists instantiation in the class
  3a27c27... playlistsview: Use the playlists managed by Playlists
  e36d61b... playlists: Remove is_smart_playlist method
  c112bc6... mpris: Use the playlists managed by Playlists
  ccceb24... playlists: Remove unused signals
  fbaf165... playlists: reorder imports
  db2336b... playlists: Update copyright header

Commits added to the branch:

  88103c8... playlistsview: Remove unused attribute _current_playlist_in
  217d362... playlists: Remove unused signal song-removed-from-playlist
  85a5879... playlists: Manage playlists deletion list internally
  4bd92d8... playlists: Make Playlist a GObject subclass
  c76a594... playlists: Add missing __repr__ method to Playlist class
  bc964ad... playlists: Turn python-specific fields into GObject propert
  2d3f10b... playlists: Dynamically instantiate the smart playlists
  03393d0... playlists: Add is_smart property to Playlist
  98bfd53... playlists: Add a SmartPlaylist class
  49018f9... playlists: Manage playlists internally
  0318741... playlists: Sort playlists
  2a04ac0... playlistdialog: Use the playlists managed by Playlists
  6cba1a7... playlists: Introduce a ready property
  540a159... playlistsview: Move playlists instantiation in the class
  0834d9e... playlistsview: Use the playlists managed by Playlists
  0757a71... playlists: Remove is_smart_playlist method
  5f1ad29... mpris: Use the playlists managed by Playlists
  bd65f5e... grilo: Remove unused function populate_playlists
  a33b9ab... playlists: Remove unused signals
  7147eec... playlists: reorder imports
  b83ef31... playlists: Update copyright header