forward ze_select_item_pre(id, iItemid, bIgnoreCost);
Index of item he try to buy.
true will ignore the cost, false will not ignore cost.
Description: Called when player opens the extra-items menu.
Or when he choose the item but before he get it.
ZE_ITEM_AVAILABLE | Shows item in the menu, player can also buy it.
ZE_ITEM_UNAVAILABLE | Show to player but he can't but it.
ZE_ITEM_DONT_SHOW | Item not appear to that player.