Improve Positions.Modified event

Currently the Positions.Modified event handler is helpful, however, I'd like to know:

1. The reason (PositionModifyReason), like the one we have in the Positions.Closed event, the PositionCloseReason enum which is very helpful too.
2. The old values that have been modified:
   1. TradeType
   2. EntryPrice
   3. EntryTime
   4. SL
   5. TP
   6. Quantity
   7. Others if apply

I was able to implement some code to monitor the changes, however, I think this event handler can be improved this way.

Thanks for your hard work.