Add ability to create Python wheels

[selimnairb]

This pull request enables the creation of Python wheels via integration with CMake. This also changes the name of the Python library from pywraps2 to the more ergonomic s2geometry.

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[jmr]

Thanks. This is requested a lot and I never had time to look into it.

Note that we plan to delete the swig wrappers soon and use pybind11 or pyclif with a more Pythonic API.

[jmr]

What's the allowed format of version? Can this be 0.11.dev or prerelease or something?

0.10 has already been released, so it's probably not great if we end up with loads of variants built at different times claiming to be 0.10.0.

[selimnairb]

I updated this to a PEP 440-compliant pre-release version number.

[selimnairb]

@jmr Let me know if there's anything more to be done on this PR and if there is anyway that I can help with the migration from SWIG. Thanks!

[jmr]

Thanks! I'll let you know when we have something in the way of a SWIG replacement.