Blender Git Loki

Sculpt: fix crash in multires layer brush

Sculpt: Cleaned up custom customdata api

* Cleaned up the SculptCustomLayer API that is
used for custom data.
* Various SculptCustomLayer references are now maintained
in ss->custom_layers and are updated automatically when
the CD layout changes.
* PBVH_GRIDS now forcibly allocate custom layers in simple_array
mode (i.e. they don't allocated real customdata layers at all).
* SculptCustomLayers can optionally be preserved in the final mesh.
* Fixed handling of CD_TEMPORARY which was broken.
* The layer brush can now split the pbvh during use.
* Persistent base data is now saved as permanent CD layers (except
for PBVH_GRIDS). This is necessary for undo, if we want we can
add special code to remove them on exising sculpt mode.
* The layer brush now uses the SculptCustomLayer API instead of
having seperate bmesh and faces/grids implementations.

* In unrelated changes, fixed curve presets for clay brushes.
- Still need to implement stabilized input mappings, which the
clay thumb brush needs.

Sculpt: more brush engine stuff

* Setting sculpt paint color from
the palette works again.
* Fixed various defaults.

Fix color palette panel

Fix a few defaults for sculpt paint brush

Fix dyntopo undo crash

Sculpt: fix paint brush defaults

fix small but significant typo

Fix a few regressions in other paint modes.

Sculpt: More brush channels stuff

Sculpt: Unnest channels.channels in RNA

* BrushChannelSet is now a pure collection. This
eliminated the annoying brush.channels.channels
paths, and also makes library overriding work.
* Now sure I've done this correctly. Struct extended
collection properties are a bit confusing.

fix python script error

remove debug line from last commit

Sculpt: more brush stuff

* Move more dyntopo settings to brush channels
* Implemented the unprojected radius hack in
the new brush system. I'm not really happy
with it, but doing it properly is going to
take some thought.

Sculpt: fix clay brush

* BRUSH_MAPPING_INHERIT is now respected
when unset.
* Also added inherit icon to
input mapping curves ui.

Fix bug in last commit

Sculpt: Add a curve brush channel type

* Added a new curve brush channel type
* Added a BKE_brush_curve_strength_ex method
that just takes preset and curve as arguments,
instead of pulling them from Brush.
* Autosmooth and topology rake now have their
own falloff curves.

Sculpt: cloth brush constraint solver is now multi-threaded

* Used a simple method of assigning constraints
to threads.
* Constraints that couldn't be assigned are solved
in the main thread.

Sculpt: move more brush settings to brush channels

Fix brush defaults bug