Port over openpilot's joystickd to opendbc

[adeebshihadeh]

joystickd in openpilot allows you to control your car with a joystick for testing the car interfacing code. Now that the car interfacing code, the joystick controller should be even simpler and moved to this repo.

This will be the canonical example for how to use this library.

Requirements:

• communicates with the car using a panda connected to a car harness
• probably want to setup a generic "panda runner" that can be reused for other things besides the joystick
• use either a keyboard or joystick (ideally no new library/dependency)
• remove joystickd from openpilot once this is merged
• good README/argparser

This is easier to do with a comma 3X + car but possible to do without one.