Blender Git Loki

Merged changes in the trunk up to revision 50829.

Conflicts resolved:
source/blender/blenloader/intern/readfile.c
source/blender/render/intern/source/convertblender.c
source/blender/render/intern/source/pipeline.c

Also addressed code inconsistency due to changes in the trunk revision 50628 (color
management with OCIO) and 50806 (UV project material). OCIO-related changes are marked
OCIO_TODO as in some other files modified in revision 50628.