[gnome-music] (24 commits) Non-fast-forward update to branch wip/jfelder/player-playlist

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/player-playlist' 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:

  5f65510... player: Remove set_playing method
  9b72ec9... player: Remove state-changed signal
  fdc6cd7... player: Rename running_playlist to playing_playlist
  7e6284b... player: Rename RepeatType to RepeatMode
  5764b6b... player: Refactor player playlist
  20f5862... player: Order signals by alphabetical order
  4cc0680... albumwidget: Refactor add_item method
  f71808e... albumwidget: Restore currently played album

Commits added to the branch:

  85066a1... artistalbumswidget: Make artist variable private (*)
  9cf6674... artistalbumswidget: Fix variable rename fallout (*)
  fd255fe... artistalbumswidget: Make selection-mode a property (*)
  0d38c63... artistalbumwidget: Add select_{all,none} (*)
  6af5634... artistalbumwidget: Mark create_disc_box private (*)
  f913a0a... selectiontoolbar: Add items-selected property (*)
  adbc3ab... selectiontoolbar: Add add-to-playlist signal (*)
  d6e82de... artistalbumswidget: Remove unused argument (*)
  dc34129... disclistboxwidget: DiscBox minor cleanups (*)
  0924388... baseview: Set selection-mode prop on state request (*)
  6456eee... headerbar: Bind selection-mode prop directly to button (*)
  5c1c512... baseview: Connect to class selection-mode property (*)
  e5ad6cc... headerbar: Handle cancel button in class (*)
  8903fbc... albumwidget: Add selection-mode property (*)
  8dbbfcb... disclistboxwidget: Remove selection-toggle signal (*)
  7c9674f... headerbar: Add selection-mode-allowed prop (*)
  6b8344d... player: Remove set_playing method
  eda141e... player: Remove state-changed signal
  1cf2fd5... player: Rename running_playlist to playing_playlist
  78c0162... player: Rename RepeatType to RepeatMode
  f3decba... player: Refactor player playlist
  06a6f5d... player: Order signals by alphabetical order
  bacda65... albumwidget: Refactor add_item method
  e6453ad... albumwidget: Restore currently played album

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