Migrate build system to meson-python

[kif]

Pro:

• speed of build
• today's standard for numpy/scipy

Con:

• one needs to declare every single (new) python file
• source distribution is tightly bound to git tool

Unknown:

• Mixing with pytest

[t20100]

one needs to declare every single (new) python file

That's a long list!

Does meson now supports universal2 build?

[kif]

Most of the work is to generate this list, but scripting it is matter of an hour or so.

Concerning universal2, I don't think ... at least scipy does not provide them.

[vasole]

Does meson now supports universal2 build?

We could add a delocate-fuse at the end to mix into a universal wheel.

I'm -1 for the time being on this. If it's not broken don't fix it.