[gnome-music/gnome-3-34] (9 commits) ...mpris: Restore goto method

[Jean Felder <jfelder src gnome org>]

Summary of changes:

  715b70c... playlistsview: Start playing once the model is loaded (*)
  d5824a2... coremodel: Add an active playlist property (*)
  d73f416... mpris: Use a correct identifier for playlists (*)
  2a207ca... mpris: Restore playlists support (*)
  e4f135e... coremodel: Add playlist type information when a playlist is (*)
  46129c2... mpris: Restore update_song_lists support (*)
  35515a5... mpris: Use active_playlist property to activate a playlist (*)
  f45d0b8... player: Remove some unused properties and methods (*)
  091988b... mpris: Restore goto method (*)

(*) This commit already existed in another branch; no separate mail sent