`macro_GetArg` had not been changed after the previous commit; however,
the old code relied on the `macroArgs->args` array being at least
`MAXMACROARGS` entries large (which was the case until the last commit).
The boundary against which it checked would have better been written as
`sizeof(macroArgs->args)/sizeof(macroArgs->args[0])`, I guess, but what's
done is done.
This should help make RGBDS portable to systems with 16-bit integers,
like DOS.
For kicks, use the macros for 16-bit and 8-bit integers.
Fix other miscellaneous things, like #include ordering and other
printf-format related things.
Reduce repitition in math.c while I'm there.
This should significantly improve performance: on pokecrystal builds, perf
reported as much CPU time spent on `yyparse` as on `sym_UseNewMacroArgs`
Measurements show ~6 seconds of improvement on that codebase.
This also fixes#321, as a bonus, due to saner management!
