v2021.09

More great work by @philwmcdonald , this is the latest deemed "stable" ;) Serial is not compiled in the default version.

See the example flash.bat for how to flash using avrdude.

Default build

#define MINMAX
#define FEEDBACK
#define SMALL_INIT
#define ENABLERESET
#define EASTER

Serial build

#define MINMAX
#define FEEDBACK
#define SMALL_INIT
#define ENABLERESET
#define EASTER

#define SERIALCOMMS
#define HUMANSERIAL
#define SERIALECHO
#define SERIALERRORS
#define SERIAL_IDLE