Blender Git Loki

Fix (irc-reported by @sergey) invalid precision value in a float RNA property.

Maximum allowed UI float precision value is 6 (which means 7 digits).

Will change code checking on that in next commit.

[cmake/dependencies] Update libsndfile to 1.0.28

Fix T52813: Audaspace: Leak when loading factory settings

Patch by Joerg Mueller (neXyon) with some touchups by me.

Merge branch 'master' into blender2.8

Math Lib: clamped rounding utility functions

Cleanup: use clamped rounding functions

Merge branch 'master' into blender2.8

Color management: When look is applied, we can not consider spaces to match

This should fix T52812 after merge to blender2.8.

Correct error in cage2d draw style enum

Merge remote-tracking branch 'origin/master' into blender2.8

Fix T52800: fix UI flickering with Mesa on Linux.

Use triple buffer by default now on all platforms, remaing ones where:
* Mesa: seems to have been working well for a long time now, and not using
it gives issues with the latest Mesa 17.2.0.
* Windows software OpenGL: no longer supported since OpenGL 2.1 requirement
was introduced.
* OS X with thousands of colors: this option was removed in OS X 10.6, and
that's our minimum requirement.

Merge branch 'master' into blender2.8

Fix Cycles adaptive compile without volumes broken after recent changes.

Differential Revision: https://developer.blender.org/D2847

Fix T52801: reload scripts causes Cycles viewport render crash.

Fix T52432: Blender crashes while using Ghost (new depsgraph)

Cleanup: Remove unused code

Cleanup: quiet warnings for GCC

Fix bad range checks

Math Lib: add divide_floor_i

Integer division that floors on negative output (like Python's).

BMesh: move bridge tools stepping logic into macro

Also use floor division since regular division was giving a bias
on negative error values.