Cleanup/deps: Clean up remnants of old python packaging method

Merge remote-tracking branch 'origin/blender-v2.82-release'

Fix: T71159 missing python3.dll

File got forgotten during the last repack of python.

libs/windows: Prevent USD exports from leaking into blender binary.

Even though we build USD as static, it still feels the need to mark its
symbols with declspec(dllexport) which means the blender binary now exports
these symbols.

this patch fixes that unwanted behaviour, however USD libs still need to
rebuild before this becomes visible in the blender binary

Differential Revision: https://developer.blender.org/D6563

Reviewed By: sybren

test: Add basic codec test for ffmpeg.

This add a basic sanity check that validates
the features we use from ffmpeg are actually
available

Differential Revision: https://developer.blender.org/D5999

Reviewed By: sybren

Fix: Building with clang on windows.

The USD landing broke building with clang on windows
due to a couple of reasons:

1) Some incompatibilities in their headers [1] only one
of them was important for us and is included in our patchset
now.

2) clangs lld wanted the full path to the libusd_b library
when using the whole archive link option, while msvc can
figure it out from just the library name.

Tested with clang/msvc and msbuild and ninja generators

[1] https://github.com/PixarAnimationStudios/USD/issues/1030

Fix: Build error with clang on windows.

A bug in llvm < 9.0.1 causes the compiler to crash when
openmp is enabled. Since mantaflow uses tbb we can safely
disable this flag temporarily for this module.

Reviewed By: sebbas

Differential Revision: https://developer.blender.org/D6446

Windows: Fix failing tests due to missing manifest.

Tests were missing a manifest, and were importing the
wrong version of Microsoft.Windows.Common-Controls
causing blenloader_test, bmesh_core_test and alembic_test
to fail due a loader error.

Cleanup/Windows: Separate out the MS-CRT into a subfolder

In older versions the ms crt was only a few dlls, in recent versions
this jumped to over 40 leading to quite a bit of clutter in our
bin folder.

This change moves the CRT into its own folder.

For developers that generally already have the runtime globaly
available on their machine, there is a new cmake option
(WITH_WINDOWS_BUNDLE_CRT, default ON) that you can use to toggle
installing the runtime to the blender bin folder, and save some
time during the initial build, this option is off by default for
only the developer profile.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6132

Cleanup: Windows Manifest usage.

We had a manifest file, but it was seemingly not used, some
settings were done using linker pragmas, some of them visual
studio would set by default for us, others where not set at all.

This patch changes:

- Single manifest file where we can maintain all settings in
a single location, removal of any linker pragmas related to
the manifest.

- Compatibly settings for win vista - win10, without this any
call to any of the GetVersion and related functions (GetVersionEx,
VerifyVersionInfo, IsWindowsXxxx) will by default say we are
on vista and OS specific optimizations in external libraries may
be missed.

-Rather than having it in the .RC file in an #ifdef which may
or may not trigger depending on the build tool used, we tell
cmake to treat it as a source file and it will do the right
thing for both the ninja and visual studio generators.

Differential Revision: https://developer.blender.org/D6136

Reviewers: brecht