Target Change Report in Airborne Operational Status too unspecific

[mrksngl]

Class AirborneOperationalStatusV1Msg only has method supportsTargetChangeReport which extracts the target change report bits but returns only a boolean on whether it is not 0.

However, values 1 and 2 have their distinct meaning, but they cannot be differentiated by this interface.

Please add a method to get the raw value.