[gnome-music] (16 commits) Non-fast-forward update to branch wip/mschraal/core-thumb-property

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/core-thumb-property' 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:

  bf0f915... artistart: Split out cache retrieval
  07abdf2... artcache: Unify DefaultIcon and _make_icon_frame
  baf1cbb... artistartstack: Disconnect cache callback
  6c88399... artistartstack: Remove DefaultIcon use
  ffee5d3... artistartstack: Remove unused variable
  1b378cf... artstack: Renamed from ArtistArtStack
  b4b3cbb... corealbum: Add thumbnail property
  3baa2ba... artstack: Add default size setter
  0764737... Rename StoreArtist to StoreArt
  e8e2067... Restore embedded art support
  8a56f80... artstack: Disconnect notification on coreobject change
  149093a... coresong: Add thumbnail property
  1eef2fd... mpris: Use CoreSong thumbnail property
  2cd0d80... utils: Add ArtSize enum
  ccf2a14... Remove coverstack.py and albumartcache.py

Commits added to the branch:

  2f851b6... artstack: fix import
  d5ba44c... artistart: Split out cache retrieval
  b912c74... artcache: Unify DefaultIcon and _make_icon_frame
  4cbef83... artistartstack: Disconnect cache callback
  090973e... artistartstack: Remove DefaultIcon use
  a2357c1... artistartstack: Remove unused variable
  b7d80e8... artstack: Renamed from ArtistArtStack
  00b3a70... corealbum: Add thumbnail property
  91c7e36... artstack: Add default size setter
  198f638... Rename StoreArtist to StoreArt
  8d95395... Restore embedded art support
  b77940d... artstack: Disconnect notification on coreobject change
  6d417d1... coresong: Add thumbnail property
  4964f2d... mpris: Use CoreSong thumbnail property
  3bf3ddd... utils: Add ArtSize enum
  c2dd36e... Remove coverstack.py and albumartcache.py