Blender Git Loki

Gizmo: dial3d option to get angles w/o wrapping

Needed for spinning multiple revolutions.

Gizmo: add snap & tweak to the dial widget

Allows holding Ctrl to snap w/ the spin tool.

Cleanup: group gizmo dial members into structs

Correct view orientation update in last commit

Gizmo: use spin widgets by default

- Now the spin tool has a persistent gizmo.
- Uses scene orientation, with additional view orientation.
- Uses the cursor center, ignoring the pivot since the
selection center is rarely useful.
- Disable most of the redo gizmo's for now since they overlap,
only allow adjusting the angle.

Note: mixing new action with adjusting previous is confusing,
we'll want to have design guidelines regarding this.

Cleanup: spin redo naming changes

FIX: linker error with a 'make deps' library set and opencollada enabled.

PCRE_LIBRARIES was not being set if the pcre library was found but not the headers.

Cleanup: move editmesh spin gizmo into own file

To mix both initial spin and redo ends up being more involved,
move into own file.

Cleanup: spin redo naming changes

Cleanup: spin redo naming changes

Gizmo: minor tweak to spin tool

Make main angle adjustment radius larger since it's the most useful.

Cycles: Fix usage of AVX2 intrinsics in AVX kernel

While building the AVX kernel, util_avxf.h/avxb.h were using some AVX2 intrinsics,
these were never called, so it wasn't a run-time issue, but the intrinsics headers
on centos excluded the AVX2 prototypes when building the AVX kernel causing build errors.

This commit cleans up the improper usage of the AVX2 intrinsics and provides AVX
fallback implementations for future use.

Differential Revision: https://developer.blender.org/D3696

build_files: bump python version in FindPythonLibsUnix.cmake to 3.7 now that all platforms have been updated

build_environment: linux/python, help python find ffi.

we were building ffi, but python wasn't finding it.

GP: Remove duplicate clean menu

build_environment: ffi/linux force predictable lib path.

ffi stubbornly wants to put libs in lib64 even when you tell it not to on some linux distributions.
patch based on sed fix the gentoo guys did [1]

[1] https://bugs.gentoo.org/462814

Merge branch 'master' into blender2.8

Install_deps: workaround building bloody broken OpenEXR release.

Cycles: Cleanup, remove dead code

Cycles: Remove unused malformed function

This isn't really possible to do the shuffle which was attempted to do.

While it's possible to achieve expected behavior, the function needs to
be rewritten. Since it's not used anyway, it's simpler to remove it for
now.