This not only simplifies all the use of _t types to the
ScummVM equivalents, it gets rid of the int32 usage in
favor of just int, solving common type clashes with the
Amiga, for which int doesn't match int32
The original had issues with the types of the method params
being 32 bits for ints, but 32 or 64 bits for string pointers.
This could easily result in a mismatch of passed params to
method definitions. To avoid this, I now pass the parameters
as a Common::Array, and a set of macros to simplify getting
the parameter values within the script method
Paul Gilbert