Refactor userinterface class into logitech controller class

[adein]

The userinterface class is primarily used to abstract the details of the (logitech) controllers from the rest of the robot. Since the Joystick class of wpilib is intended to be subclassed, a Logitech class should be created that subclasses Joystick.

The userinterface class would then reference objects from this class, or the userinterface class will be removed altogether if it is no longer useful.