Blender Git Loki

Depsgraph: Remove residue of motion path optimization

This needs to be re-implemented in a new fashion, without touching global list
of bases and become compatible with the new dependency graph.

The idea to go here would be to create new dependency graph for motion path
evaluation, bring a single object in there (which will pull all dependencies
at a construction) and use that.

Needs working copy-on-write first tho.