New port: net-im/py-toxcore-c

PyTox provides a Pythonic binding, i.e Object-oriented instead of C
style, raise exception instead of returning error code.

WWW: https://github.com/TokTok/py-toxcore-c

PR: 216869
Submitted by: yuri@rawbw.com
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D9476