[gnome-music] (8 commits) Non-fast-forward update to branch wip/mschraal/async-queue

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/async-queue' 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:

  7f3016e... artstack: Rework ArtCache use
  0b195b9... asyncqueue: Add generic AsyncQueue class
  62d4208... artcache: Use AsyncQueue for cache retrieval
  f85b9ef... grltrackwrapper: Use AsyncQueue for storing art
  f6954f6... artcache: Rename DefaultIcon.Type
  edc7491... artcache: Remove unneeded argument from DefaultIcon.get
  016968a... artcache: Move DefaultIcon out of artcache.py
  b80b250... artstack: Load default icon faster

Commits added to the branch:

  3e85282... asyncqueue: Add generic AsyncQueue class
  f2e724d... artstack: Rework ArtCache use
  5b153a2... artcache: Use AsyncQueue for cache retrieval
  f6a4c28... grltrackwrapper: Use AsyncQueue for storing art
  502e270... artcache: Rename DefaultIcon.Type
  fd66433... artcache: Remove unneeded argument from DefaultIcon.get
  91e6bd4... artcache: Move DefaultIcon out of artcache.py
  eab7ae6... artstack: Load default icon faster