#441 house lore needs a map for items -> spawn

when we finalize a placement of a house item we set the spawn to hold the item id:

    tmp->SetPickupItemID(uniqueItem->details.item_id);
    tmp->SetPickupUniqueItemID(uniqueID);

we need a zone level mapping from item id to spawn.. given house lore is a single item we would probably just have an itemid to spawn id map and not worry about duplicates since its just to assure there is no dupe lore house item.