[gnome-music] (9 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:

  bbe16c8... corealbum: Add thumbnail property
  77a4d70... artstack: Add default size setter
  ba604d7... Rename StoreArtist to StoreArt
  e4ef884... Restore embedded art support
  2b8ad50... artstack: Disconnect notification on coreobject change
  465c14a... coresong: Add thumbnail property
  33f0b0b... mpris: Use CoreSong thumbnail property
  cc73028... utils: Add ArtSize enum
  0812556... Remove coverstack.py and albumartcache.py

Commits added to the branch:

  512f513... corealbum: Add thumbnail property
  b977aee... artstack: Add default size setter
  f59a72d... Rename StoreArtist to StoreArt
  3dc6381... Restore embedded art support
  4acedcf... artstack: Disconnect notification on coreobject change
  496d05d... coresong: Add thumbnail property
  b238c57... mpris: Use CoreSong thumbnail property
  c07272d... utils: Add ArtSize enum
  8b8cfb1... Remove coverstack.py and albumartcache.py