deps_builder: Bump download time out to 30 mins

The timeout was set to 60 seconds, which was problematic
for some of the larger files like boost from the blender
svn mirror.

Fix: Missing GeometryNodeCustomGroup

This is a minor change to add some plumbing code
to support custom geo nodes. This is working the
same way as the custom cycles and compositor nodes.

An example add-in is attached to D10784

Reviewed By: JacquesLucke

Differential Revision: http://developer.blender.org/D10784

Makefile: add update_code target

Convenience target for updating the code, skipping SVN.

The Python script supports it, but this wasn't exposed in the makefile.

Ref D10457

MSVC: ASAN support for VS 16.9

This enables ASAN support when used with VS 16.9
enable as usual in cmake with the WITH_COMPILER_ASAN
option, or when using make.bat just tag on `asan'
to the invocation, ie: `make lite 2019 asan`

MSVC: Asan support for 16.9

This enables ASAN support when used with VS 16.9
enable as usual in cmake with the WITH_COMPILER_ASAN
option, or when using make.bat just tag on `asan'
to the invocation, ie: `make lite 2019 asan`

Differential Revision: https://developer.blender.org/D7794
Reviewed By: brecht, sergey

OSL: add basic OSL shader template

Add a basic OSL shader that shows how inputs
and outputs work and do some simple math with
them.

This template is a happy medium between the
templates we already ship, empty_shader is a
little too bare, and the other templates are
a little "too much" and you end up having to
delete a whole bunch of stuff.

a great starting point for some experimentation!

Differential Revision: https://developer.blender.org/D9933

reviewed by: brecht

make_deps: Update blender package mirror URI

Final location in SVN was slightly different
than we were planning on.

CMake/Deps: Python 3.9.2

Straight up minor version bump, no anomalies to report

Reviewed By: sebbas, sybren

Differential Revision: https://developer.blender.org/D10523

Cmake/deps: Update OSL to 1.11.10.0

This bumps OSL to 1.11.10.0. OSL Has a new build time
dependency: Clang, and more importantly it expects
clang and llvm to share a library folder, which it
previously for us did not.

This patch changes:

-OSL Update to 1.11.10.0

-refactor the llvm/clang/clang-tools-extra builds into the llvm
build using the llvm-project tarball for building that has all
of the subprojects in it.

-update ispc/openmp builds since clang no longer its own dependency
and they have to depend on the llvm build now.

-Update the windows builder to use the 64 bit host tools since it
ran out of ram linking clang

-Since OSL now needs clang to link successfully a findclang.cmake
has been provided for linux/OSX

Differential Revision: https://developer.blender.org/D10212

Reviewed By: brecht, sebbas, sybren

CMake/Windows: Update for new XR_OPENXR version

This updates platform/platform_win32.cmake to support
both the old and new library names for OpenXR.

The new version links against one additional system
library and the debug library filename changed ever
so slightly.

This is a temporary workaround and can be removed
once the new lib versions have landed.

CMake/Windows: Detect Boost version

Rather than hardcoding the lib names, read
boosts version.hpp and extract the version
from there.

This will make it easier to land lib changes
in the near future.