[mutter] (20 commits) ...clutter/stage: Replace _cogl_util_get_eye_planes_for_screen_poly()

[verdre <jonasd src gnome org>]

Summary of changes:

  8809ee9... clutter/util: Generalize ROUND_TO_256THS (*)
  d08f724... clutter/actor: Round to 256ths when projecting for picking (*)
  78c648f... cluter/stage: Use 1.0 for z-near (*)
  1f99395... clutter: Use graphene_matrix_inverse() (*)
  175851e... clutter/stage: Simplify view setup (*)
  793ca68... clutter/stage: Use graphene_plane_t for clipping planes (*)
  01ccc54... clutter/actor: Remove unnecessary check (*)
  964229a... clutter/actor: Trivial code shuffling (*)
  338a927... clutter: Remove ClutterPlane (*)
  a84dccf... clutter/stage: Use graphene_frustum_t for clipping (*)
  80bd44c... clutter/actor: Use switch instead of if/else (*)
  496aea5... clutter: Remove CLUTTER_CULL_RESULT_PARTIAL (*)
  b6fa26c... clutter/stage: Don't setup view on pick (*)
  feb8397... clutter/stage: Move clip frustum to ClutterPaintContext (*)
  cf9d061... clutter/stage: Remove outdated comment (*)
  63d0556... clutter/stage: Move pick cache invalidation out of setup (*)
  d1d3ac6... clutter/stage: Use multiple frusta depending on the redraw  (*)
  2ca2078... clutter/actor: Remove region culling (*)
  f7d0461... clutter/stage: Simplify frustum setup function (*)
  bc41a88... clutter/stage: Replace _cogl_util_get_eye_planes_for_screen (*)

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