Various small fixes.
Can change calendar country in UnderlyingSymbol now.
Added TryRemove method to ConcurrentNotifierDictionary.
Added ConcurrentNotifierBlockingList class.
Updated sample app to include cancelation of a real time data stream.
Client can now cancel real time data streams. Added RealTimeStreamInfo struct to keep track of these streams more easily.
SIM data source now supports canceling real time data streams.