ranges can be used efficiently. move the auto-allocated builtins to
0x10000000-0x7fffffff. should be more than enough :)
use static builtin tables ("nul" terminated) instead of a series of
function calls to add builtins to a vm. should be more memory efficient.
and probably has enough bugs to leave the Orkin man scratching his head,
but it works and allows you to do neat things like write classes in GIB
(amazing!) and subclass builtin classes (which are Object and Thread at the
moment, Hash should be coming soon as a replacement for stem and leaf
variables).
