[Function] random item/variable 1.0

This Function does something which is useful for some scripts.

This function gives you item or adds/substract the variable value.

Example:

	mes "Random between 7227,1 and 502,2 and 7227,2";	callfunc "rand_add",1,7227,1,502,2,7227,2;	next;	mes "Random between 1 Cash Points and 2 PvP Points";	callfunc "rand_add",2,"#CASHPOINTS","Cash Points",1,"pvp_points","PvP Points",2;	next;	mes "Random items that are mentioned in function";	callfunc "rand_add",0;	close;

Setting the value negative for variables will decrease them, while doing so for items, will not delete the item.