Add PID autocalibration routine.

[lonelymyp]

An example of printing with an uncalibrated PID. Heavy hot end + high speed = Waves on the surface after corners

Procedure name in the original code: void PID_Autotune(void); Implementation example: https://github.com/Misfittech/nano_stepper/blob/b731396f2ec985e0e7baea13b0282bdc214aa09b/firmware/stepper_nano_zero/stepper_controller.cpp#L1644

Since there is no way to connect via uart, pid calibration becomes a problem, you need to reflash the controller to change the parameter manually. The original code had a PID autocalibration routine. It would be great to bring this procedure back and bring it to the menu on the display.

menuItem_t MenuMain[] = {   
        {"Calibrate", menuCalibrate, NULL},
        {"Test Cal", menuTestCal, NULL},
        {"Autotune PID", menuCalibrate, NULL},  //add new item
        {"Motor mA", motorCurrent, currentOptions},
        {"Hold mA", motorHoldCurrent, currentOptions},
        {"Microstep", microsteps, microstepOptions},
        {"EnablePin", enablePin, enablePinOptions},
        {"Dir Pin", dirPin, dirPinOptions},
        { "", NULL, NULL}
};

Of course, this will need to be repaired:

options_t controlLoopOptions[] = {
        {"Simple"},
        {"Pos PID"},
        {"Vel PID"},
        {""}
};

And for this you need to transfer the missing code for pidFeedback https://github.com/Misfittech/nano_stepper/blob/b731396f2ec985e0e7baea13b0282bdc214aa09b/firmware/stepper_nano_zero/stepper_controller.cpp#L1078