Blender Git Loki

clean up code a bit

Fixed two remaining performance bugs with dyntopo:

* Normals are now updated in threads.
* The sculpt neighbor code was using the slower BM_LOOPS_OF_VERT
instead of BM_EDGES_OF_VERT, fixed.

Sculpt Expand: Default Face Set boundary modes to topology

Sculpt Poly Loop: Symmetry support

Merge branch 'master' into sculpt-dev

Cleanup: Clang format

Cloth Filter: Add pinch origin modes

Cloth Filter: Add symmetry support to pinch deformation mode

Merge branch 'master' into sculpt-dev

* Added a new CustomData type for dyntopo vertex data: MDynTopoVert.
It stores:
- Original coordiates, colors and mask (which were previously four
seperate layers).
- A bitmask with (currently) one bitflag, whether or not a vertex is
on a boundary.

I needed to cache calculating vertex boundary state (which involves
iterating over the edges surrounding a vertex) and got fed up with
having so many CD layers for dyntopo. This struct consolidates them
and saves having yet another layer just to store a flag.

Merge from master

Merge branch 'master' into sculpt-dev

Merge branch 'master' into temp_bmesh_multires

Merge branch 'master' into sculpt-dev

Merge branch 'master' into sculpt-dev

Sculpt Expand: Split snap event into two separate events

Sculpt Expand: Add Poly Loop Falloff mode

Merge branch 'master' into sculpt-dev

Face Sets Topology: Improve keymap and creation delay

Sculpt Poly Loop: Improve loop direction detection