Adding comments in parameterstring_to_intarray(..)

Adding detailed comments in function parameterstring_to_intarray(char*, int, int*, int)
where a string containing a semicolon-separated list of numbers (example: '51;66;38')
gets parsed into an array of integers like [51, 66, 38].
Merge branch 'master' of github.com:thfi/ScriptInterpreter