backup go
first trace
webinterface: separate root/svg handler
webinterface: live screen image
webinterface: screen grid
webinterface: data double buffering w/o races
webinterface: start state exchange
webinterface: add frame sync and state info
webinterface: receive state from hardware
webinterface: show received header
webinterface: prototype parameter setting
webinterface: software gain control
add usart.c in preparation of serial communication