Unlike, say, the scriptclass i/j/k stuff, these tempstrings are only
purely visual, and there's no known glitches to manipulate them anyway.
Thus I think it's safe to make this cleanup.
This fixes a source of undefined behavior, where the int returned by
ss_toi() would be random garbage memory if the string passed into it
would be empty. That's because if the string is empty, there are no
characters to parse, so nothing simply gets put into x.
The easiest way to pass an empty string in to ss_toi() would be to use
script commands with empty arguments.
Previously, it was a hardcoded list going up to fifty.
This time, it's less hardcoded. Most of the time, it will take a number,
find out its tens-place word, find out its ones-place word, and combine
the two together. There are special cases for the teens, and the numbers
zero through nine, and one hundred.
Also, now if it is given a negative value, it will just return "???"
instead.
If there are more than one hundred it will still say "Lots".
