[gnome-music] (18 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:

  c5276e3... coreartist: Rework retrieval
  baf882d... artistart: Split out retrieval and cache storage
  6a19122... artcache: Unify DefaultIcon and _make_icon_frame
  de9aefb... artistartstack: Disconnect cache callback
  1e46465... artistartstack: Remove DefaultIcon use
  11a7ae4... artistartstack: Remove unused variable
  393f104... artstack: Renamed from ArtistArtStack
  67f78b7... artstack: Add default size setter
  609ba50... corealbum: Add thumbnail property
  5a68c95... Rename StoreArtist to StoreArt
  a71502b... Restore embedded art support
  bfc006b... artstack: Disconnect notification on coreobject change
  42ffba1... coresong: Add thumbnail property
  a773699... mpris: Use CoreSong thumbnail property
  29ae835... utils: Add ArtSize enum
  6e676b6... Remove coverstack.py and albumartcache.py
  e58bb51... grltrackerwrapper: Clarify function name
  ada5532... grltrackerwrapper: Consolidate art queries

Commits added to the branch:

  5502612... coreartist: Rework retrieval
  3a1f925... artistart: Split out retrieval and cache storage
  af0ce45... artcache: Unify DefaultIcon and _make_icon_frame
  392a001... artistartstack: Disconnect cache callback
  518b6bd... artistartstack: Remove DefaultIcon use
  0642e43... artistartstack: Remove unused variable
  dad4209... artstack: Renamed from ArtistArtStack
  c7a1308... artstack: Add default size setter
  f52a36e... corealbum: Add thumbnail property
  f49537d... Rename StoreArtist to StoreArt
  42aec5a... Restore embedded art support
  ecd315a... artstack: Disconnect notification on coreobject change
  ee1b3fa... coresong: Add thumbnail property
  c2b8ce9... mpris: Use CoreSong thumbnail property
  81b81f1... utils: Add ArtSize enum
  57577e2... Remove coverstack.py and albumartcache.py
  f72b914... grltrackerwrapper: Clarify function name
  88f4804... grltrackerwrapper: Consolidate art queries