Read joystick inputs

[joshkarbi]

We want to use some sort of joystick/gamepad combination to drive the rover.

We have to right callback functions that can read inputs from the control.

This should include:

• Button presses on the controller
• X and Y magnitudes for the stick control(s)

A tiny callback for generic key press events is in Main.java
" primaryScene.setOnKeyPressed(event -> { ... } ); "
If the joystick inputs can be registered as key presses then this should work.
If not, find a good library and use it.

To test:

• Get a joystick from Geoffrey and try to print to the console some values from it
• See if it makes sense

[joshkarbi]

@nbattel fork the repository from the master branch and create your own branch (ie. call it nick)