Implemented debug output on uart1 for stm32
Replaced hardcoded eeprom offsets with documented constats
Fixed a bug affecting telemetry on Atmega328p using the invert_telemetry flag.
Loads of changes:
STM32 board introduction: NOT TESTED
XMEGA renamed to ORANGE_TX to be more explicit
DSM: added reset if cyrf freezed
Validate: added a validate file to verify the different compilation
options