Blender Git Loki

Sculpt-dev: Add brush_eval field to Paint

* Paint now has a brush_eval field which
is used in leu of ->brush if non-null.
* This lets us get rid of all the annoying:
`brush = ss->cache ? ss->cache->brush : BKE_paint_brush`
code. Now it's just BKE_paint_brush.
* Used by SCULPT_run_command.
* Also fixed nasty scene spacing bug.

Sculpt-dev: fix multires crash in last commit

Sculpt-dev: bugfixes

* Fixed PBVH_FACES vcol draw bug.
* Fixed boundary smooth being turned on
if its temp customdata layer exists.
* Fixed unnesting of brush panels from
last commit improperly showing up
in the workspace tab for sculpt
instead of the brush tab.

Add comments, other minor improvements

Single full screen image.

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Merge branch 'temp-gpu-texture-partial-updates' into temp-gpu-image-engine

Fix issue when image user is a nullptr.

Detected a crash.

Merge branch 'master' into temp-vert-normals-cleanup

Merge branch 'temp-ui-cpp' of git.blender.org:blender into temp-ui-cpp

Attempt to resolve build error

Merge branch 'temp-gpu-texture-partial-updates' into temp-gpu-image-engine

Added API documentation.

Use enum class for ePartialUpdateIterResult.

Use enum class for ePartialUpdateCollectResult.

Added CPP Api.

Merge branch 'master' into temp-gpu-texture-partial-updates

Merge branch 'master' into temp-gpu-texture-partial-updates

Merge branch 'master' into temp-gpu-texture-partial-updates