[mutter] (15 commits) Non-fast-forward update to branch wip/carlosg/sound-abstraction

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/sound-abstraction' 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:

  70ea9ee... core: Add MetaSound abstraction
  87263f1... core: Make MetaBell use MetaSound to play the bell sound

Commits added to the branch:

  f64eba5... screen-cast-src: Add VideoCrop support (*)
  20c9ca2... screen-cast: Add screen-cast-window interface (*)
  9319345... window-actor: Implement MetaScreenCastWindow interface (*)
  dbe7279... screen-cast-session: Add screen-cast window mode (*)
  ec25f3a... screen-cast-session: Add support for RecordWindow (*)
  bbcb66d... window: Add window id (*)
  c786b6c... screen-cast-session: Add window-id support (*)
  7a5e0c7... window: Expose the client type in the API (*)
  781ec74... window: Fix introspection warnings (*)
  49c2be4... Replace Bugzilla by Gitlab URL in DOAP file (*)
  9f3d321... input-settings: treat a serial of 1 as serial of 0 (*)
  a6b677d... core: Add MetaSound abstraction
  c931693... core: Make MetaBell use MetaSound to play the bell sound
  de83131... workspace: Port to MetaSound
  28b9094... build: Make libcanberra no longer optional

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