NAME
       FindToken -- retrieve the location inside the Blitz command libraries
                    of a given token.

   SYNOPSIS
       tokenptr = FindToken(token);
       A3                   D0:16

       struct BlitzToken * tokenptr = FindToken(UWORD token);

   FUNCTION
       This function will traverse the Blitz command libraries. If the given
       token is found, the address of the token is returned - else a standard
       ERROR token.

   INPUTS
       token - a 2 byte token number

   RESULT
       tokenptr - a pointer to the token (or an ERROR token)