API C Item.IsItemDataCached

Needs summary.
 isCached = C_Item.IsItemDataCached(itemLocation)
 = C_Item.IsItemDataCachedByID(itemInfo)
==Arguments==
===IsItemDataCached===
:;itemLocation:
===IsItemDataCachedByID===
:;itemInfo: : ItemLink or ID
==Returns==
:;isCached:
==Patch changes==