Updated version of the libtoxcore Python wrapping of toxygen

[emdee-is]

This project seems to be abandoned. It's important because it has a very good CTYPES wrapping of libtoxcore in Python, and the alternative to that in https://github.com/TokTok/py-toxcore-c does not have much coverage yet.

There is an updated version of just the wrapper directory of toxygen in https://git.plastiras.org/emdee/toxygen_wrapper/ which uses CTYPES and has good coverage, including NGC groups and toxencryptsave,

Hopefully the excellent test suite from Py_Tox can be ported to it.