Blinkenlights

Refactor the firmware's protocol processing to make it maintainable.

Give the WebApp a real protocol engine, so it can do things like flow control or reading values from the board. Still untidy, but it'll get there.

Merge pull request #10 from sklochkov/main

Add two new clients implementing game of life and tetris

Stop filtering available serial ports to USB ID, to allow for Bluetooth cpnnections too.