Added a check before each method to ensure that the RXTXRobot is connected before executing the command
Added helper methods to set/get mixer speeds
Added hiding of the RXTX Version mismatch error...since we don't care about it and it just confuses the students
Moved some of the header print statements so they make more sense
Added some more spacing to the output text
Fixed small bug in the GUI of the robot not actually connecting
Converted all outputs to use the streams that it is assigned instead of piggybacking off of System class
Fixed some bugs in the GUI and removed a redundant main method that shouldn't be there