Update PIDController widget to new PIDController class

[Starlight220]

Update the PID widget to the new PIDController, mainly the enable part.

[sciencewhiz]

Since the old PID Controller has not been removed, I don't think the Shuffleboard PID Controller widget should only support the new widget. Either a new widget should be created (and the wpilib new PID Controller updated to use it) or the documentation should be updated to cover the differences.

[carbotaniuman]

@PeterJohnson Disposition to close - won't fix.

[PeterJohnson]

Actually, we just had a discussion on this, and the thought was we would update this widget and add a backwards compatibility widget for the old PIDController.