Initial version

Changes:

• refactored main file, removed unoptimised code, lowered overall size with 300 bytes
• made the LED to work on PWM rather than direct IO, this way no resistor is needed on the PCB
• removed manufacturing commands from old code, they are simply not necessary anymore

Issues:

• RC 5 decoding code is still unreadable and unoptimised, also running an unpercise algorithm
• interface between files is unclear
• there are various unused defines that simply has no place in the code

"TODO"s:

• integrate Atmel RC 5 decoding for Attiny series (it is ~100 bytes all)