Package with libpaper

[rrthomas]

It would be nice if users didn't have to install libpaper separately (see #69).

Packaging with pip seems possible, with https://github.com/pypa/cibuildwheel/

But this doesn't give much help for building and installing libpaper—it's more aimed at building Python extensions.

An alternative would be to package libpaper and PSUtils for Conda, but that would only help Conda users.