Blender Git Loki

Merge branch 'master' into asset-engine

Partial merge only, UI in filebrowser has been heavily changed and need
more work...

Conflicts:
release/scripts/startup/bl_ui/space_filebrowser.py
source/blender/blenloader/intern/versioning_280.c
source/blender/editors/space_file/file_draw.c
source/blender/editors/space_file/filelist.c
source/blender/editors/space_file/filelist.h
source/blender/makesdna/DNA_space_types.h
source/blender/windowmanager/intern/wm_operator_props.c