[mutter] (6 commits) Non-fast-forward update to branch wip/carlosg/clutter-seat

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/clutter-seat' 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:

  dfd3815... clutter: Drop ClutterDeviceManager
  95da446... backends: Do not use device IDs on idle monitors
  9daad74... backends: Drop get_relative_motion_deltas() vfunc
  4b4142a... backends: Use latest pointer position if no pointer constra
  efcc7f0... backends: Set pointer constrain/relative motion hooks befor
  d8a1921... backends: Move warp_pointer() to ClutterSeat

Commits added to the branch:

  a4b17e1... clutter: Drop ClutterDeviceManager
  8818de7... backends: Do not use device IDs on idle monitors
  e59d668... backends: Drop get_relative_motion_deltas() vfunc
  ddddc4a... backends: Use latest pointer position if no pointer constra
  b309cd0... backends: Set pointer constrain/relative motion hooks befor
  3626571... backends: Move warp_pointer() to ClutterSeat