Relaxed yaw hold (like in original stabilize)
Prepped for first Cruise flight mode test
With yaw-lock and pilot-control disabled
Will fly towards last heading at same altitude
Changes:
-changed meaning of CRUISE_TURNING
-added TRANSITION_TIME
-added CRUISE_AOA
-added YAW_LOCK
recovery before changing the throttle control in cruise mode
Ingediende versie  -  echter nog niet opgeschoond
Code for FFquad.
Stable_quat not tested yet.
Cruise mode not working yet.