#18: Optimize reading and parsing events

[Sidequest-Ju]

Fix of issue #18

• add a concurrent queue with two worker threads
• EventReader: reads incoming events from stream and enqueues them
• EventWorker: dequeues events and parses them into a AmiMessage
• DataEventArgs is extended to directly retrieve the parsed AmiMessage (no additional parsing needed)
• But this also removes the use of Reactive Extensions