Stub in an NQPRegex type.
Stub in an NQPRegex type.

This will serve as the code object for regexes, rules and tokens, and
will come to hold the caps, NFA, etc.

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