So this was painful. kprintf() supports most of
the format specifiers from BSD now, except for the
$ sequence. It has gotten a general overhaul and
is significantly more sophisticated, bloated and
slower now. There is also some minor stuff i
forgot about, like the 't' length modifier, but
that isn't so important right now and will be
fixed later(TM).
Turns out you can't pass a va_list to subroutines
as per the C standard, even though it worked
perfectly fine on ARM. Well then, the entire
kprintf thing needs to be refactored anyway at
some point in the future, so that more formatting
options are supported.
