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WIP: Cache absolute transformation matrices of ClutterActor

Jonas Dreßler requested to merge verdre/mutter:cache-more-matrices into master

This MR starts caching the absolute transformation matrices (more specific: The complete modelview + projection matrix), it cuts down CPU time spent building those matrices by about 50% in cases where lots of actors are moving.

Depends on !1276 (merged) (included), !1267 (merged), gnome-shell!1308 (merged)

WIP since this depends on another fix

Edited by Jonas Dreßler

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