[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:

  17927e4... coreartist: Rework retrieval
  8ba3d7d... artistart: Split out retrieval and cache storage
  83ab276... artcache: Unify DefaultIcon and _make_icon_frame
  7bbdde9... artistartstack: Disconnect cache callback
  7cbf7bb... artistartstack: Remove DefaultIcon use
  18b8bef... artistartstack: Remove unused variable
  9750e58... artstack: Renamed from ArtistArtStack
  ae61357... artstack: Add default size setter
  bcef1d6... corealbum: Add thumbnail property
  7f8a789... Rename StoreArtist to StoreArt
  61cd987... Restore embedded art support
  860d94d... artstack: Disconnect notification on coreobject change
  1e0ba30... coresong: Add thumbnail property
  c026188... mpris: Use CoreSong thumbnail property
  3fc5bde... utils: Add ArtSize enum
  a702b2f... Remove coverstack.py and albumartcache.py
  3f49972... grltrackerwrapper: Clarify function name
  b1920ba... grltrackerwrapper: Consolidate art queries

Commits added to the branch:

  a17e2a3... coreartist: Rework retrieval
  29cdee0... artistart: Split out retrieval and cache storage
  6891a14... artcache: Unify DefaultIcon and _make_icon_frame
  ea63e74... artistartstack: Disconnect cache callback
  cb6d65e... artistartstack: Remove DefaultIcon use
  f7eff1e... artistartstack: Remove unused variable
  5cf7a6e... artstack: Renamed from ArtistArtStack
  7f7b21b... artstack: Add default size setter
  a985d7f... corealbum: Add thumbnail property
  118cf08... Rename StoreArtist to StoreArt
  361e5a9... Restore embedded art support
  f40e67b... artstack: Disconnect notification on coreobject change
  0826d31... coresong: Add thumbnail property
  3947b43... mpris: Use CoreSong thumbnail property
  33a7b46... utils: Add ArtSize enum
  ef567e9... Remove coverstack.py and albumartcache.py
  951b6d8... grltrackerwrapper: Clarify function name
  3d14bc9... grltrackerwrapper: Consolidate art queries