Import combinator and allocator APIs into SWIG. Next is glue. Need to fix unions in HParsedToken and HCaseResult.

effects throughout, including use of inttypes.h/PRI[ud]64 because printf() is
still stuck in a long world, conversion of %lu to %zu for printing values of
type size_t, and changing/renaming the g_check_cmp* family of functions.

Desugaring functions are all done! But we're not ready for the CF backends yet because desugared structures still need to be stashed in the parser.

Expanded vtable for methods to determine whether a combinator is ok to use with regular or CF grammars.

Benchmark is actually broken right now, for mysterious double-free related reasons. I will dig into this tomorrow.