Migrate mostrobotpy to semiwrap

[virtuald]

This also:

• Fixes Publish allwpilib binaries in separate packages and use pkg-config .pc files #101

[TheTripleV]

Are the native.* packages there to split off downloading libs from the wrapping? Will native.wpiutil be published to PyPI separately or be bundled into robotpy-wpiutil before publish?

[virtuald]

They will be published to pypi separately. See #101 for history.

The download aspect is part of it, but really it's about the wpilib binaries being platform-specific and not interpreter specific. By having separate wheels we consume less space because it's not duplicated per-interpreter, and for wpimath in particular we are getting closer to our quota on pypi.

If we were able to use abi wheels this advantage would go away.

I'm not 100% sold on this change yet (or the naming for it), open to arguments against it.