clutter/cleanup: Remove most of remaining deprecated types
This heavily removes all the stuff that was deprecated before even the merge of Clutter inside Mutter. The remaining ones are:
- ClutterContainer API, handled by !3377 (merged) & possibly a followup PR/commit
-
ClutterBinLayout::x-align
/ClutterBinLayout::y-align
&ClutterBinAlignment
-
ClutterActor.realize
/ClutterActor.unrealize
/ClutterActor.hide_all
/ClutterActor::pick
but some of those are still used and would need more thinking than just a mechanical removal.