Hardware joystick/gamepad input support

[NathanaelGandhi]

Requirments

Incorporate a functional estop (can be simulated or real) that immediately stops operations. Disengaging the estop must not immediately resume the robot system but only permit resuming (meaning two actions are necessary to resume). For full marks your system must be able to recover/resume after an e-stop event.

• Simulated estop added with #32

  Tasks

• [ ] Real estop button on [keyboard || controller]