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.
about the path it's handed (need to get even more paranoid, though). the
string module just has char replacement so far. Add Draw_CenterPic to
r_progs.c, but this will only last till qpic_t is supported in qc.
the load menu almost works: just need to add key handling and fix a bug in
PF_sprintf
