Port to ESP32

[drf5n]

I ported a version of Arduinozyme to the ESP32.

Since there's more space, I made the cli parsing non-blocking, in the hope that I could hook in a telnet server to the on-board wifi and make it wireless.

Compiles under Arduino IDE V2.0.4 with the "esp32 by Espressif version 2.0.7" board manager set and the "DOIT ESP32 DEVKIT V1" board.

 _blink the onboard LED at a sweep of frequencies:_   100{2dkT 100m}2d0o  
 _try analogRead() on all the ports:_   40{ksp _on_ kp}