0.2.0

Added

• Introducing termination message indicating that the main simulation would like to quit #5
• Enabled tests for this project and implemented partial test for ExtSimulation as part of #5
• JavaDoc for many message classes #59
• Implemented ExtEvDataTest as part of #77

Changed

• Refactored ExtTrigger -> ExtSimMessage and ExtTriggerResponse -> ExtSimMessageResponse #5
• Renamed messages to ease understanding #62
• Separating departures and arrivals in message protocol, properly handling exceptions #77