g2/g3 support

[hardboy]

Hello, thank you very much for the firmware, but could you also make a hex file with the settings for the CNC_WORKSPACE_PLANES functionality so that the g2/g3 commands can be used on the printer.

I understand that the project has been frozen for a long time, but I would like these functions in my printer, although assembling the project is difficult for me and I cannot do it without your help.