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Blit node & more paint node shenanigans

Georges Basile Stavracas Neto requested to merge gbsneto/effects-paint-nodes into master

This MR tightens up some paint node code, and add a new paint_node vfunc to ClutterEffect, which will allow us to gradually port effects to the paint node API. It also adds a new ClutterBlitNode, which was a requirement to port GNOME Shell's blur effect to the paint node API (gnome-shell!1339 (merged)).

The next logical step after this MR lands is port ClutterOffscreenEffect, and all its subclasses, to the new paint node API, as well as adding a ClutterPaintNode *node parameter to clutter_actor_continue_paint(). After that, a fully retained node rendering is within a stone's throw.

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