An item's pickup message is a map string that the HUD used as the format
of an unbounded usprintf into a 256-character buffer. It is now used as a
format only if its one conversion is the count the game passes
(ustring_format_takes), with usnprintf, and shown as plain text
otherwise. usnprintf now also terminates a string it cuts short, and
ustrncpy_terminated is a bounded copy that always terminates.
Milenko
c1694f607f