Blender Git Loki

Fix polyfill test to compile again after master merge.

Needed extra coord sign argument. Should probably add more
tests to test that argument. Also, the Empty test and the
UnorderedColinear tests now fail and need attention.

Add more tests to bpyunits.

Only LENGTH type for now.

This showed two limits to current BKE's units code:
* When converting string to value, we use too few precision for units' values (6 digits),
not good esp. when mixing big and small units (like e.g. miles and inches). Will fix that
in next commit.
* When converting values to string, 'precision' parameter ignores order of magnitude of the value,
which leads to invalid results with big numbers (e.g. 1000000mi gives 1000000.004mi with prec of 3).

Merge branch 'master' into gtest-testing

Fix doc strings.

Deduplicate some code for struct-seq initialization

Make units a real submodule.

Minor cleanup/changes to api & docstrings

Merge branch 'master' into temp-pyapi-units

Added multi subject-polygon capability, preliminary raster implementation.

Add icons for a few items in the menus.

Change edit mode selection to pie menu

Add view and shade pie menus.

Game Engine Scene Graph - whitespace cleanup

Manta vars initialization, support for inflow objs in setup file, *.obj export for bounding box[ -1,1]

Some minor tweaking on temps buffers...

Merge branch 'master' into opensubdiv-modifier

Conflicts:
source/blender/blenkernel/intern/subsurf_ccg.c
source/blender/windowmanager/intern/wm_init_exit.c

Modifications from Campbell's review, thanks! :)

Bugfix: Units for time translate transforms (action/nla editors) was messed up

When autosnap mode was nearest frame or nearest marker, this was incorrectly
converting the units to seconds, making this display unusable for anything.

Backport revisions for blender-rc2

f95817c, b0708dd, 2b7ff6d, 1d982ea, 781de74,
871a8eb, db750b9, 6d4f062, f325ddb, 31e15b5,
be55327.

First step toward a basic units py API (exposes all supported unti systems & types, and str_to_value/value_to_str functions).

Also adds a skeletton of unittest file for it!

Reviewers: campbellbarton

CC: carter2422

Differential Revision: https://developer.blender.org/D416

Added support for drawing, moving, and inserting vertices in multiple subject polygons