[gnome-music] (9 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:

  2c35649... mpris: Change naming convention to snake_case
  c0bea5c... mpris: Move dbus connection logic to DBusInterface
  e739835... mpris: Handle signals emissions internally
  2179efc... mpris: Make app attribute internal
  65dc1bc... mpris: Make player attribute internal
  a194e6f... mpris: Add doctring for all MPRIS methods
  b9d72d5... mpris: Fix some PEP-8 issues
  b443046... CI: Remove mpris.py from flake8 ignored files
  31a9426... mpris: Update copyright information

Commits added to the branch:

  e92b000... mpris: Change naming convention to snake_case
  cf73247... mpris: Move dbus connection logic to DBusInterface
  f94005b... mpris: Handle signals emissions internally
  7b71b10... mpris: Make app attribute internal
  b63d82a... mpris: Make player attribute internal
  8b711ef... mpris: Add doctring for all MPRIS methods
  59bdc02... mpris: Fix some PEP-8 issues
  f5a4cc3... CI: Remove mpris.py from flake8 ignored files
  16075f2... mpris: Update copyright information