Push a string onto the stack
int SLang_push_string (char *s)
SLang_push_string pushes a copy of the string specified by
s onto the interpreter's run-time stack. It returns zero
upon success, or -1 upon error setting SLang_Error
accordingly.
If s is NULL, this function pushes NULL
(SLANG_NULL_TYPE) onto the stack.
SLang_push_malloced_string