QRcode : IA externalized in a class

It will be easier to code different IA, based on the virtual function getCommand().
Merge branch 'master' of https://github.com/Iheve/CannonBall_de_voitures_autonomes

Conflicts:
	QRcode/QRcode/main.cpp
Merge branch 'master' of https://github.com/Iheve/CannonBall_de_voitures_autonomes
Send metrics through MQTT
QRcode : send 2 char on the serial bus (instead of 1)