Blender Git Loki

Cloth: updating active_faces and fixed bug for collapse edges

Now collapse edges works but incorrectly most of the time.

Don't recreate reference local space on each redraw

Set this up on session start.

Add GHOST_XrSession class for cleaner & safer session management

Session code and data structures are now localized. But also, this
enables sessions to use deterministic destruction to end itself cleanly.
So whenever an error occurs, we can use stack unwinding which will cause
graceful ending of the session.

Merge branch 'master' into greasepencil-object

Outliner: Activate elements on walk select

Rather than just setting flags, activate outliner elements
to support toggling modes. This still needs some work while in
synced selection mode. Outside of synced selection it works
well

Merge branch 'master' into soc-2019-outliner

rename file to BLI_small_multimap

Cleanup: Use zero_v4 to init the default value.

add vertex colors to tetrahedons for visualization

create SmallVector from MappedArrayRef

flatten float3 attribute of container

improved particle to tetrahedon conversion

Merge branch 'master' into greasepencil-object

Conflicts:
source/blender/draw/engines/gpencil/gpencil_engine.h

initial particle info node

Fix append_n_time reallocating every time

Fix ArrayLookup for the case when all slots are used or dummies

GPencil: Remove custom equals functions and reuse BLI_math compare

I have found the compare function when looking at BLI_math to add my functions, so these are duplicatd and can be removed.

GPencil: Cleanup equals functions and add for floats and V2

Merge branch 'master' into soc-2019-bevel-profiles

Many changes, mostly profile widget sampling:
- Added new sampling method to profile widget for curves.
- Flipped X orientation of profile in profile widget
- Small UI changes to profile widget code
- Removed "Sample Only Points" option as its functionality is now
accessible by setting the number of segments correctly
- Cleanup in profile_widget.c. Progressing towards final code there