Actor: Add most remaining vfuncs.

* clutter/src/clutter_vfuncs.defs: Hand-write the ClutterActor vfunc
  definitions.
* clutter/src/actor.hg: Add most missing vfuncs, and remove the
  quotes from the vfunc names.

  Wrongly wrapped vfuncs can cause fundamental problems, so be
  ready to comment these out to investigate strangeness.