Blender Git Loki

WIP: More work on modifiers

Add new modifier for thickness and reorganize code

Merge branch 'master' into id_copy_refactor

Py API doc generation: remove reference to "Blender/Python Add-on Tutorial"

That one has been moved to wiki!

Eevee: Fix double promotion.

Buildbot: Switch to GCC-7 for Linux build slaves

This is GCC version was used for Testbuild1 and Testbuild2.

Fix blenderplayer

Manipulator: allow ID-writing for most callbacks

Manipulator: split alpha out of color property

Gives more convenient access from Python: `mathutils.Color`

Also correct some copy-paste error w/ property subtypes.

Fix crash re-registering the same manipulator type

Wasn't unlinking from the group instance.

Manipulator: add snap flag

PyDoc: minor change to recent workaround

- Isolate workaround in single string and link to issue.
- Quiet unused file warning (since it's an include).

Merge branch 'master' into blender2.8

PyAPI: don't use deprecated PyModule_GetFilename

Allows compiling with newer Python versions.
Also add missing decref when compiling as a py-module.

Manipulator: allow py manipulators w/o properties

These could be used for manipulators that run operators.

BPY API: Fix broken ref link

BPY API: Fix usless links leading to compile errors

See https://github.com/sphinx-doc/sphinx/issues/3866 for more information

Fix modifier update when change mode

New subdivide stroke modifier

This modifier add intermediary points to stroke to get more control points for other modifiers as Noise.

This is not a subsurf modifier. This will be a different one.

Refresh cache when modifiers are changed

The draw cache must be set as dirty after move up/down or remove modifier

Fix T52058: Jumping to keyframe causes Blender to freeze indefinitely

Revise the logic here to be more robust when keyframes with
similar-but-different frame numbers (e.g. 70.000000 vs 70.000008)
would cause the search to go into an infinite loop, as the same
keyframe was repeatedly found (and skipped).