[gnome-music] (12 commits) Non-fast-forward update to branch wip/jfelder/mpris-cleanup

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/mpris-cleanup' 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:

  264a3ad... mpris: Simplify GetPlaylists method
  be6b7d1... mpris: Do not send PlaybackStatus property if unchanged
  5c7ef39... mpris: Change naming convention to snake_case
  28c3d53... mpris: Move dbus connection logic to DBusInterface
  a6feb79... mpris: Handle signals emissions internally
  22b30e3... mpris: Make playlists attribute internal
  b9d69c7... mpris: Make app attribute internal
  debe6fd... mpris: Make player attribute internal
  e775f71... mpris: Make player_toolbar attribute internal
  c3e09dc... mpris: Fix some PEP-8 issues
  44fdd37... CI: Remove mpris.py from flake8 ignored files
  de6c8c9... mpris: Update copyright information

Commits added to the branch:

  c73c5c0... mpris: Simplify GetPlaylists method
  9b09f85... mpris: Do not send PlaybackStatus property if unchanged
  1b11ea5... mpris: Change naming convention to snake_case
  9ce264b... mpris: Move dbus connection logic to DBusInterface
  adc9e03... mpris: Handle signals emissions internally
  049927b... mpris: Make playlists attribute internal
  2f0f98d... mpris: Make app attribute internal
  c21b057... mpris: Make player attribute internal
  161738e... mpris: Make player_toolbar attribute internal
  823ace3... mpris: Fix some PEP-8 issues
  7747d3a... CI: Remove mpris.py from flake8 ignored files
  ebe3155... mpris: Update copyright information