Subscribe to joystick feedback

[matthew-reynolds]

🚀 Feature Request

Part of #13.

The WPILib offers the ability to send haptic feedback to the controllers. We would like to support this. Each joystick is given two 'rumble' values, an unsigned 16bit integer for each left and right.

These will be wrapped in a message of two uint16 arrays, one for left and one for right, and published from the robot. The driver station will need to subscribe to these and apply it to the gamepads.