Blender Git Loki

Fix T61619: Some VSE attributes with keyframes are not sensibly evaluated
when the scene is referenced as a strip from another VSE scene

Fix T49658: Evaluation / animation of f-curves does not correct
for a scene's position within another scene

Solution: Evaluate animdata before rendering scene seqbase.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4755