[mutter] (3 commits) Non-fast-forward update to branch wip/carlosg/no-event-source

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/no-event-source' 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:

  39f267c... clutter: Add clutter_stage_get_event_actor() API call
  6c4ffa0... clutter: Rewrite clutter_event_[gs]et_source()
  fee6d17... clutter: Remove "source" event union fields

Commits added to the branch:

  ed23327... clutter: Add clutter_stage_get_event_actor() API call
  73c5af8... clutter: Rewrite clutter_event_[gs]et_source()
  05a9cb0... clutter: Remove "source" event union fields