[mutter] (7 commits) Non-fast-forward update to branch gbsneto/effects-paint-nodes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'gbsneto/effects-paint-nodes' 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:

  9983fb3... clutter/paint-node: Walk up paint node tree to find framebu
  436b25c... Introduce ClutterEffectNode
  0f471a6... clutter/effect: Add paint_node vfunc
  3590892... clutter/paint-nodes: Add opacity overriding to ClutterActor
  652c179... clutter/paint-nodes: Add new ClutterLayerNode API
  74cb0c6... clutter/paint-nodes: Add serialization to layer node
  bc1e719... Introduce ClutterBlitNode

Commits added to the branch:

  dc7d7ad... clutter/paint-node: Walk up paint node tree to find framebu
  1f1d43e... Introduce ClutterEffectNode
  ca16f71... clutter/effect: Add paint_node vfunc
  b58deb2... clutter/paint-nodes: Add opacity overriding to ClutterActor
  b566f40... clutter/paint-nodes: Add new ClutterLayerNode API
  b796650... clutter/paint-nodes: Add serialization to layer node
  5c9ea8b... Introduce ClutterBlitNode