Blender Git Loki

Remove cache controls and prefetching.

This will be rewritten from scratch and done in steps to allow for
proper testing of the rest of the system.

Add a frame rate parameter to the CacheFile.

Merge branch 'master' into cycles_procedural_api

Merge branch 'master' into cycles_procedural_api

Allow max delta frame to be 0

Fix missing dependency graph update when going out of proxy mode.

Merge branch 'master' into cycles_procedural_api

Merge branch 'master' into cycles_procedural_api

comment some functions

Split Mesh::pack_primitives into two functions

Cleanup: make AlembicProcedural::add_object private

This function should not be used outside of the procedural.

Merge branch 'master' into cycles_procedural_api

Merge branch 'master' into cycles_procedural_api

Remove RNA optimization, is in a separate branch now

Pass bScreen to BlenderSession

Add a way to disable multithreading for primitive packing

This is just to remove potential noise from multithreading when doing
benchmarks.

Fix a few issues with prefetching.

We need to make sure that the data for the frame that we are trying to
render is indeed in the prefetched cache if it is not in the main cache.

We also need to avoid race conditions when reading from a partially
loaded cache.

Finally, use a specific cancel query mechanism to early exit when
cancelling prefetching.

Rename some variables to clarify them.

Fix missing update when adding or removing materials.

fix compile error following bad merge