Add a way to persist an NFA to a data structure.
Add a way to persist an NFA to a data structure.

This will (eventually) be used to serialize the NFA instead of using the
nqpattr hack.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp