[gnome-music] (11 commits) Non-fast-forward update to branch wip/jfelder/player-ui-logic-separation

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/player-ui-logic-separation' 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:

  0bd0a6a... player: Merge two redundant signals
  9ce8c56... player: Rename play_previous/next to previous/next
  857a212... player: Move SelectionToolbar to toolbar
  f89009f... player: Factor out player ui

Commits added to the branch:

  9661709... flatpak: Allow GNOME media keys (*)
  1c94bd7... flatpak: Enable MPRIS (*)
  557555d... trackwidget: Correctly justify title label (*)
  af9650b... views: Fix header_bar subtitle property (*)
  dd603b2... albumsview: Remove unused method update_title (*)
  7774bcf... widgets: Use utils functions (*)
  2cd05f2... player: Merge two redundant signals
  c631919... player: Rename play_previous/next to previous/next
  87e3ef5... player: Move SelectionToolbar to toolbar
  c928a4a... player: Factor out player ui
  13ce5e8... playertoolbar: Use pygi-composite-templates

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