[gnome-music] (21 commits) ...Use CoverPaintable directly, drop ArtStack

[Marinus Schraal <mschraal src gnome org>]

Summary of changes:

  09a0eff... asyncqueue: Favour new queue additions (*)
  6fc37e3... artstack: Disconnect ArtCache on coreobject change (*)
  c85cae9... artstack: Set default icon on coreobject change (*)
  4001862... artstack: Drop transition for rework (*)
  ea05513... artstack: Drop alternate stack page (*)
  4b924c7... artstack: Drop unneeded function (*)
  5c0a0f9... artstack: Rework var naming (*)
  1d984f1... artstack: Unneeded to add named stack page (*)
  e1fc65c... artstack: On dark mode only update placeholder (*)
  9ae7781... artcache: Split out media art loading (*)
  296f809... artstack: Use MediaArtLoader directly (*)
  9460563... Remove ArtCache (*)
  85c4119... Remove DefaultIcon class (*)
  3ba011c... artstack: Move dark mode switch to CoverPaintable (*)
  d8ba070... coverpaintable: Add icon-type property (*)
  16d023d... artstack: Move loading logic to CoverPaintable (*)
  1bf208a... coverpaintable: Split out texture caching (*)
  ccd2cfb... Revert "artstack: Add .card on medium and large arts" (*)
  f8011a7... coverpaintable: Adapt Gdk.RGBA calls (*)
  97cd35b... coverpaintable: Flip argument order (*)
  4dcbe70... Use CoverPaintable directly, drop ArtStack (*)

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