UseItemOnCreature

Function:

 * boolean useItemOnCreature(item, creature)

Parameters:

 * item - can be item id/name.
 * creature - can be creature name, or creature ID, or strings: "self", "target".

Return value:

 * This function return an boolean indicating if items were succesfuly used. Returns true if success, false if failure.

Description:

 * This function can be used to use items on creatures. To use runes on creatures function castRune should be used instead.