[rotorcraft] removed unused define
[ardrone] removed USE_ACTUATORS_AT define because it no longer used
[ardrone2-raw] Moved all raw-navdata stuff to imu_ardrone2_raw to cleanup main. Also moved the call to the uart1_handler to the imu periodic, which should be somewhere else but dont know yet how/where.
[gps] If you don't have a gps, just choose one anyway in your airframe and in case of ardrone it will fly manually still.