- Transfered some attributes from SerialAbstractManager to SerialCommandManager subclass, making the necessary alterations on constructors.
- SerialCommandManager now queues and sends MKCommands instead of FCCommands, making it more abstract.
- SerialNavManager now queues messages on SerialCommandManager instead of calling SerialCommandManager.sendCommand().
- SerialCommandManager.stop() now also stops the SerialPort.
- More convenient thread management through SerialAbstractManager.
- Updated the tests to see if the changes worked; there was no problem.
- Added some comments/javadoc.