====== GetSubString ======

<code>string GetSubString(string sString, int nStart, int nCount=2147483647);</code>

The original documentation can be found here: [[https://nwnlexicon.com/index.php?title=GetSubString]]

On Sinfar This function has been extended work like PHP'substr function: [[https://php.net/substr]]
so:
 - nCount is optional
 - nCount and nStart can be negative