Move hardcoded configurations to a file on filesystem about smartknob HOT 4 OPEN

JSON on an spiffs is a great idea.
If wifi is working then the calibration json file can also be written via a webpage running on the esp32, with a nice interface for setting the values. Here is an example of where i’ve done something similar in the past https://github.com/mcmadhatter/LocoNet2/tree/development/examples/esp-locoio-web

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If an actual file is desired an INI file might be much better than JSON: easier to parse in code, easier to read for humans.

I tend to agree though that a file might be overkill, dumping a C struct to non-volatile storage might be enough

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I have started work on this on my fork , currently just the knob configurations are supported. Next steps is to add support for information that can be gathered via auto calibration.

https://github.com/mcmadhatter/smartknob/tree/JSON

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Adding a JSON library would add significant code size. If setting the values is exposed by the firmware (custom menu, webpage etc.) it is probably more convenient to just dump a C struct into a file. Also the ESP32 provides some pseudo-EEPROM which is ideal for calibration values etc without the overhead of a whole filesystem given that I expect no one to manually flash those setting on a SD card or similar.

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