Blender Git Loki

Sculpt-dev: use standard UI idioms

Thanks to @TonatiuhdeSanJuli�n on chat
for helping me with this.

Merge branch 'master' into sculpt-dev

Sculpt-dev: update pbvh_print_mem_size

Sculpt-dev: fix another freelist id bug

Sculpt-dev: add corruption check

Stopgap measure to deal with rare
PBVH corruption until I have the
time to properly track it down.

Sculpt-dev: Replace usage of smallhash with ghash

SmallHash doesn't deal with repeated removals
and insertions very well.

Sculpt-dev: fix missing NULL assignment

Sculpt-dev: Performance improvements

* PBVH_BMESH construction is now partially
threaded.
* Fixed n**2 behavior in freelist-based
bmesh id implementation. I'd really
rather get range-tree faster, but
this works as a stopgap.
* Removed a bunch of debug ATTR_NO_OPTs.

Sculpt-dev: fix compile error

Why can't we have -werror settings
the same on all compilers and platforms?

Sculpt-dev: fix test

Sculpt-dev: get vcol render layer working

* Mesh now has a render_color_index member.
+ We really need an attribute ref system
based on (domain, type, name) triplets.
* RNA uses render_color_index in all three
cases (loop colors, vert colors, and
the generic attribute types).
* PBVH draw uses render_color_index too.

Sculpt-dev: all vertex colors now live in single
UI list.

* Added an index to Mesh for active color attribute.
This seems janky to me, shouldn't this (along
with the active attribute index) be a
domain, name, cdtype triplet?
* Added a little api to preserve the active attribute
and color indices when changing mesh customdata
layouts. See above comment.
* The vertex color panel is now completely unified.
* TODO: allow setting render color layer (not sure how
to do this).

Merge remote-tracking branch 'origin/temp-sculpt-colors' into sculpt-dev

This was necassary because sculpt colors is currently broken in master,
and temp-sculpt-colors hasn't been approved for merging to master
yet.

Merge branch 'master' into temp-sculpt-colors

Merge branch 'master' into sculpt-dev

Sculpt-dev: add tool slot override to sculpt.brush_stroke

* Sculpt.brush_stroke now has a property to override
the tool slot.
* Note that this is somewhat different from how this
was typically done in the past. Instead of physically
switching slots we instead load the overriding slot's
brush's channels into ss->cache->tool_override_channels.

Basic idea is based off of {D6515}

Fix python error

temp-sculpt-colors: fix out of bounds error

tempt-sculpt-colors: editmode fix

temp-sculpt-colors: implement patch review items