Returns whether an item in the bags is a part of a saved item set.
See also Container functions.
index- The ID of the container the item is in. (
slot- The slot within the container where the item is. (
isInSet- Indicates whether the item belongs to a saved equipment set. (
setName- The name of the equipment set, as can be obtained from
GetEquipmentSetInfo. Is nil of the first return value is false. (