Added autopilot level trim to Stabilization module.
Added UI support for setting actuator trim and level bias values on fixed-
wing platforms.
Changes requested in review.
Added new control mode, Enhanced Attitude. Enhanced Attitude uses the trim
angle as the attitude setpoint.
Fixed conflicts from rebase.
Removed Yaw from TrimAngles.
Renamed EnhancedAttitude --> AttitudePlus.
Rename stabilizationDesired --> stabDesired.
Fixed accidental changes during merge.