New API object for Deleted OpenOrder (152)

One can get OpenOrders from an account via the API using object 52 however once an open order is removed by deleting it or if it just ends as a payment plan does, then the OpenOrder no longer exists as it is changed hidden.

When doing reporting this info would be helpful to better understand the average length of subscriptions including the ones that have been deleted or ended.

The Orders object 46 and DeletedOrders 146 are good but in the cases where an Order has multiple OpenOrders attaches the data on dates get confusing and so in those cases the hidden data is helpful,