Blender Git Loki

Merge blender2.8 branch.

Means that from now on, we work based on blender2.8, no more master!

Conflicts:
source/blender/blenloader/intern/readfile.c
source/blender/blenloader/intern/writefile.c
source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
source/blender/editors/interface/interface_ops.c
source/blender/makesdna/DNA_ID.h
source/blender/makesrna/intern/rna_ID.c