[gnome-music] (10 commits) ...coverpaintable: Cleanup MediaArtLoader references

[Marinus Schraal <mschraal src gnome org>]

Summary of changes:

  7896a3c... texturecache: Add function to clear the texture callback (*)
  342d620... coverpaintable: Improve invalidation logic (*)
  b2cf46d... coverpaintable: Smarter reset on coreobject change (*)
  a785fa3... texturecache: Refer to classwide variable with classname (*)
  ad931e5... texturecache: Indicate the loading state of the uri (*)
  a02c72f... texturecache: Add timing information (*)
  e6dcf1d... texturecache: Drop instance wide use of uri variable (*)
  262ef43... texturecache: Add size limit (*)
  5097e96... texturecache: Drop cache on low memory (*)
  7754de2... coverpaintable: Cleanup MediaArtLoader references (*)

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