added a super basic packet handling mechanism with a tiny buffer,
allowing for easier expansion later on. Added display code, waiting for
actual display to test, improved the cpu load script
Added avr_han project structure with arch definition and cargo config.
Remember to switch to nightly!
Added a basic initial project, with 4 leds (1 for CPU core). Each led
grows in intensity depending on CPU core load. Added a py script to
generate cpu load data on serial port.
