[gnome-music] (10 commits) Non-fast-forward update to branch wip/mschraal/grltrackerwrapper-filter-fix

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/grltrackerwrapper-filter-fix' 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:

  7a05e7b... grltrackerwrapper: Fix media id filter clause

Commits added to the branch:

  7bb6ece... artcache: Add widget argument to init (*)
  cada49d... defaulticon: Pass widget to DefaultIcon (*)
  4730914... defaulticon: Drop unneeded cache identifier (*)
  353ba44... Move default icon type enum to utils (*)
  5e46fb1... Smaller empty state illustration (*)
  43e91fd... corealbum: Add missing gtype_name (*)
  1c518f5... Introduce CoreObjectType enum (*)
  27ebf18... Add GriloArtQueue (*)
  c8c8eea... grltrackerwrapper: Use GriloArtQueue for art retrieval (*)
  6466d8c... grltrackerwrapper: Fix media id filter clause

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