menu: Added new z-offset calibration menu for non-delta printers

[JeffPerando]

I recently put Klipper on my Sovol SV06, and I found calibrating the Z-offset very laborious, particularly compared to using the stock firmware. There's a lot of going between your PC and your printer to input the necessary commands and actually performing the paper test respectively, and I wanted to simplify that.

Some notes:

• The main intent behind a lot of the code is to ensure a good user experience; I didn't want the printer to crash because the user forgot to do something beforehand, or accidentally clicked the wrong option.
• I didn't touch the Delta calibration menu because I don't have that style of printer to test if I break any features.
• I did not add menu options for the bisect commands TESTZ Z=+ and TESTZ Z=- since I felt they would just clutter the menu. It's easier to adjust the offset manually in the direction that you want by a small amount.
• The begin options run ABORT and G28 before starting the calibration test. ABORT does nothing if the user isn't already probing, and if they are, then accidentally clicking begin again just resets things, making it safer. G28 is run because homing is necessary to adjust the Z-offset, and doesn't take long, so might as well. Plus in my experience as a user, Klipper crashes if you try to do almost anything before homing, and this is a source of frustration I want to avoid.
• I tried to make it skip the G28 instruction if the printer was already homed, but this concatenated it with the previous command, in this case ABORT, and then it just wouldn't run the following command. Example:

  • ABORT
    {%- if 'z' not in printer.toolhead.homed_axes -%}
        G28
    {%- endif -%}
    PROBE_CALIBRATE

  • // Unknown command:"ABORTG28"

[nefelim4ag]

// Unknown command:"ABORTG28"

JFYI,
You can remove the - sign from the template, it is to strip symbols

-Timofey

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