- do reporting of breaching in-air only in geofenceCheck
- remove geofence_violation_reason_t
- replace geofence_breached field in GeofenceResult.msg with 3 fields
(one for each GF type: max dist, max alt, custom geofence)
- the warning message after breaching a GF is only done by Commander,
and it's specific to the GF type failure
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>