Loops

This merge implements the playlist feature which allows users to load multiple saved tracks and play them. They can make tracks loop multiple times and set a specific start time for the playlist to start. The changes to the code are primarily in UIComponents.pde to add this playlist ui and FlightEngine.java contains the updated backend implementation.

Issues that still need to be addressed: The prior issues Phil included on the previous merge request !35 (merged) Color sweep path name is broken that leads to unexpected behavior for that pattern Update the spacing and text on the record button to clarify its functionality to the user