Blender Git Loki

Fix invalid parameter type in bmlog.

* Eeek, left in an ATTR_NO_OPT attribute

* The dyntopo remesher is now a bit smarter about avoiding
certain degenerate cases that produce lots of bad geometry (and
also bad PBVHs that slows down the whole mesh).
+ A very small amount of surface smoothing is now applied by dyntopo.
+ The recursive functions that expand the region considered by dyntopo
now ignore "front face only" for depths less then 5.
+ The number of edges dyntopo can split or collapse in one run has been cut in
half to 4k.
- This limit is also now dynamically adjusted by a measure
of how skinny the edges are.

Merge branch 'master' into sculpt-dev

Sculpt: Add operator to store a limit surface manually

Merge branch 'master' into sculpt-dev

fix compile error

Fix last commit flipping the order of booleans.

* Got box trim tool working for dyntopo
- This required implementing SCULPT_UNDO_GEOMETRY for dyntopo.
That turned out to be more work then I expected. Basically
it writes an entire Mesh to BMLogEntry, which can be swapped
with current bmesh. Tricky part was patching bm log ids.

Fix possible crash with dyntopo and clay strips normal filter

Merge branch 'master' into sculpt-dev

Edit face set brush now works for pbvh bmesh

Merge branch 'master' into sculpt-dev

Enable color filter brush for pbvh bmesh

One more null ptr check

* Fix null ptr bug in automasking code

* Fix bug in last commit where boundary flags weren't properly
updated after symmetrize.

Fix memory corruption in sculpt neighbors code

* Boundary info is no longer initialized with
SCULPT_boundary_info_ensure, instead PBVH_BMESH keeps
track of boundary vert flags internally. This prevents
nasty first-click lag on the smooth brush as well as anything
with autosmooth.

* Fixed SCULPT_dynamic_topology_sync_layers to properly sync
active/render/clone/mask layers indices.
* Fixed sculpt color bugs in pbvh drawing for bmesh.