- This switch is done by the new script 'am2' (replacing 'am') and
updated Makefiles.
- Also fixes a bug in RF433Debug where the buffer used to copy strings
from PROGMEM was not big enough. To ensure such a bug does not
re-occur, now RF433Debug lib checks this condition and should that be
the case, it prints out a fatal error and stops.
- Debug lib could clash with other lib users, and has been renamed into
RF433Debug.
Same with Serial, renamed into RF433Serial.
- Some constants/classes used inside these libs, have also been renamed
to have RF433 prefix.