[gnome-music] (20 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:

  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
  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

Commits added to the branch:

  29c5bd1... songwidget: Define song_number property (*)
  f195268... songwidget: Bind coresong properties (*)
  5192d07... coreartist: Rework retrieval
  2ad4c99... artistart: Split out retrieval and cache storage
  b964add... artcache: Unify DefaultIcon and _make_icon_frame
  ae7c692... artistartstack: Disconnect cache callback
  61bd48e... artistartstack: Remove DefaultIcon use
  8dec1e8... artistartstack: Remove unused variable
  8408b97... artstack: Renamed from ArtistArtStack
  ffa2b36... corealbum: Add thumbnail property
  25be52d... artstack: Add default size setter
  b71e614... Rename StoreArtist to StoreArt
  0cb14f5... Restore embedded art support
  ca1e709... artstack: Disconnect notification on coreobject change
  183e55b... coresong: Add thumbnail property
  80c9eb3... mpris: Use CoreSong thumbnail property
  37b2263... utils: Add ArtSize enum
  6c83b9e... Remove coverstack.py and albumartcache.py
  85e3f64... grltrackerwrapper: Clarify function name
  096a9d2... grltrackerwrapper: Consolidate art queries

(*) This commit already existed in another branch; no separate mail sent