Blender Git Loki

Revert test changes to `lib_id_test.cc`.

Reset this file to master state.

Add initial `BLI_math_time` with a 'seconds explode' function.

Allows to explode a given amount of seconds into a random set of
days/hours/minutes/seconds/milliseconds.

Also add matching test.

Merge branch 'master' into experimental-build

Attempt to investigate potential issue in tests on Windows.

Merge branch 'master' into experimental-build

More attempts to fix numpy for windows/apple...

More attemps to fix numpy building...

Another attempt at fixing numpy path issue.

Some more debug prints i build system...

CMake: More verbose message in `find_python_package`

Fix several issues with handling of numpy in CMake.

Issues were:
* Abusing of `WITH_PYTHON_INSTALL_NUMPY` by both Audaspace and
Mantaflow.
- `PYTHON_INSTALL` options only decide whether we copy python (and
some extra modules) in our Blender installation. On linux it
makes much more sense to use global python installation.
- Now we have instead a proper `WITH_PYTHON_NUMPY`
* Bad assumptions regarding path of headers relative to path of python
module.
- In current Debian testing, modules are under `python3.9`
directory, while headers are under `python3` directory.
- Now we properly `find_path` for headers as well, modifying
`find_python_package` to take an optional argument for headers.

Note that the required changes done to `extern` libraries are in
blender-specific files that do not exist upstream.

Differential Revision: https://developer.blender.org/D9773

Merge branch 'master' into experimental-build

Revert "LibOverride: Add initial support for adding new NLA tracks."

This reverts commit dbe330318011c137fc09d6a238f9282c983dadbf.

LibOverride: Add initial support for adding new NLA tracks.

Also makes NLA tracks and strips overridable.

Most of the work was as usual checking operators and adding protections
against illegal operations in override context.

Differential Revision: https://developer.blender.org/D9611

Merge branch 'master' into experimental-build

Merge branch 'master' into experimental-build

Revert "Attempt to fix missing ssize_t type on Windows."

This reverts commit c01174354f900f625159aedc9ae27f4089699544.

Revert "Second attempt to fix windows missing ssize_t type."

This reverts commit 5dc643fa98189ada7a394449e220d4f70177d41e.

Revert "Attempt to fix windowz building due to missing ssize_t type, take III."

This reverts commit 241ac50684249056bbc8ca6db7f4f11342174807.

Attempt to fix windowz building due to missing ssize_t type, take III.