[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:

  b020695... coreartist: Rework retrieval
  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

Commits added to the branch:

  b13c8f9... coreartist: Rework retrieval
  fcd13d8... artistart: Split out cache retrieval
  be4e289... artcache: Unify DefaultIcon and _make_icon_frame
  c78e77d... artistartstack: Disconnect cache callback
  14dcad2... artistartstack: Remove DefaultIcon use
  e8caddb... artistartstack: Remove unused variable
  2cc16de... artstack: Renamed from ArtistArtStack
  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