[gnome-music] (25 commits) ...Add NotificationManager

[Marinus Schraal <mschraal src gnome org>]

Summary of changes:

  6c28208... mpris: Generate a playlist d-bus path compatible with track (*)
  ac83474... Port to tracker3 (*)
  eba53b3... trackerwrapper: Update URI filter to DataObject split (*)
  69edc25... trackerwrapper: Create private SPARQL connection (*)
  2bf2565... grltrackerwrapper: Update "get songs" queries to newer Trac (*)
  9a2c94a... grltrackerwrapper: Port album discs query to new Tracker/Gr (*)
  d839384... grltrackerwrapper: Port query for songs in disc to new Trac (*)
  aaf25df... grltrackerwrapper: Port album queries to new Tracker/Grilo  (*)
  6175c09... grltrackerwrapper: Port artist albums query to new Tracker/ (*)
  bf973c1... grltrackerwrapper: Port artists queries to new Tracker/Gril (*)
  e1a112e... grltrackerwrapper: Port search queries to new Tracker/Grilo (*)
  4ff89d7... grltrackerwrapper: Port queries to resolve album from album (*)
  cc24155... coregrilo: Specify the private store path to the Grilo plug (*)
  f16f386... grltrackerplaylists: Update to Grilo/Tracker3 expectatives (*)
  1d0fa65... trackerwrapper: Make favorite property updates go through t (*)
  231e480... coresong: Look up for the correct tracker3 grilo sources (*)
  0cae85d... trackerwrapper: Make play-count property updates go through (*)
  29ec917... trackerwrapper: Make last-played property updates go throug (*)
  52a09db... trackerwrapper: Adapt to Tracker 3 update API change (*)
  52f27b9... flatpak: Port to tracker3 (*)
  4033af3... trackerwrapper: Use the log object from the application (*)
  c22b1b6... Bundle Tracker 3 in the Flatpak for systems which don't hav (*)
  708a6a8... coregrilo: Clean up plugin activation for Tracker (*)
  cdb1844... coregrilo: Avoid Tracker configuration crash (*)
  b5cd745... Add NotificationManager (*)

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