Blender Git Loki

Sculpy dyntopo: fixed various topology bugs

* Fixed crash in dyntopo collapse. The
loops around vertex iterator dyntopo uses
doesn't actually work on non-manifold meshes,
or meshes with invalid normals, this was not
being checked in pbvh_bmesh_collapse_edge.
* Rotate tool now works with dyntopo.

Sculpt dyntopo: another bugfix from today's earlier commits

Fix a few bugs in lat commit

fix missing curly braces

Sculpt dyntopo: Fix bug with edge collapse

Sculpt dyntopo: Add edge API

* Added a minimal edge API to query edge
boundary states.
* This is necassary because the previous approximation,
testing if two adjacent verts are boundaries, breaks
for triangles.

Merge branch 'master' into sculpt-dev

Sculpt: Quantize mask filter

Tweak last commit to not affect base face set.

Sculpt dyntopo: split face set boundaries on mirror boundary

Added an option to split face set boundaries on mirror
boundaries; currently only DynTopo supports this.

Very useful for making hard edges along mirror lines.

Sculpt dyntopo: improved boundary smoothing

It's kind of hackish mathematically.

Sculpt dyntopo: added a smoothing factor for sharp boundaries

Works by projecting non-boundary verts onto boundary vert
normals and weighting by boundary_smooth_Factor.

Missed an ATTR_NONNULL fix

change 'error' to 'warning' in a printf

Sculpt dyntopo: undo bugfixes

* Fixed nasty undo bug related
to now rewinding BMLogEntry subchains properly.
* Fixed bug in dyntopo collapse

Sculpt dyntopo: Who knew gcc's nonnull attribute is 1-based

Sculpt dyntopo: Cleanup past few commits

* Removed some ATTR_NO_OPTs
* Made pbvh_split_edges disallowed
4-valence splits if cleanup topology
mode is on

Sculpt dyntopo: support sharp edge flags

* Sharp edge flags are now supported and are
treated much the same as face set boundaries:
+ Dyntopo preserves them
+ Interior smoothing treats them as boundaries
+ Corners are detected and pinned in smoothing
+ TODO: add a brush flag to ignore sharp boundaries
for smoothing.
* Seams are also preserved, but don't affect smoothing.
* BMLog now saves edges.
* The new edge split function is enabled.
* Dyntopo now pushes new combined BMLog entries in
its top-level function, to avoid scary id reuse
edge cases.
* SCULPT_vertex_is_boundary/corner now take a bitmask
of which types of boundaries you wish to query instead
of check_face_sets.

Sculpt Vertex Colors: New sample color operator

Merge branch 'master' into sculpt-dev