ISKeyValueList; add new item type of ISList

ISKeyValueList and ISKeyValueListRO now support an item type of ISList.

ISKeyValueList now supports the following new functions:

• GetList2
• Returns the item as an ISList object
• Note, GetList can still be used, but GetList2 is more efficient as it natively supports ISLIst
• SetList
• Adds or Updates an Item as an ISList
• This function adds the ISList as an object, i.e. a Reference to the object
• Consider adding as ISList.Clone to take a snapshot of the object