Blender Git Loki

Commited the latest code in branch

Select Engine: Move some private members out of select context

Cleanup: Move select_engine function to corresponding header

Windows/deps: Add/fix openxr_sdk dependency

There were a few typos here and there, and the openxr_sdk does not respect the cflags we give it hence a patch was added to work around this undesirable behaviour.

UI: add URL presets

This adds a url-preset operator to simplify opening re-usable links.

- Standard websites have their own tool-tip.
- De-duplicate logic to get URL's that include version information.
- Reporting bugs no longer needs to have all information
included in the URL.

D5498 by @luisbg with edits.

Cleanup: comparison warning

Merge branch 'master' into temp-lanpr-staging

BLI: double version of some math functions.

Merge remote-tracking branch 'origin/master' into temp-lanpr-staging

Update embree to support all kind of curve

Fix release notes showing twice in the splash-screen

Cleanup: clang-format, sorted lists

Fix crash with no grid unit

GPencil: Check the material converted from curves has something
Check the material has Stroke or Fill enabled and avoid unactivated materials.

Fix T61286: Viewport grid units not visible

The original code was commented on.
Unlike blender 2.79, the grid units are now displayed only when RV3D_VIEW_IS_AXIS.
The visible subdivisions in the grid are made by the GPU and depending on the pixel.
The code used here only mimics this behavior and adds a bit of overhead.

Reviewers: fclem, campbellbarton

Subscribers: FloridaJo, zlsa, rl.amorato, EitanSomething

Differential Revision: https://developer.blender.org/D4325

Refactor to use abstract mesh interface.

If use abstract mesh interface instead of BMesh then there is hope
that modifier can avoid need to convert to/from BMesh.

Merge branch 'master' into soc-2019-openxr

fix set vector remove

GPencil: When convert curve do not enable Stroke always

When the converted curve has only fill, the stroke must be set to off.

Merge branch 'master' into greasepencil-object