Airspeed Selector: repurpose wind estimator into an airspeed (selection, validation) module.

This new airspeed module does:
  -runns an airspeed validator for every airspeed sensor present, which checks measurement validity and estimates an airspeed scale
  -selects another airspeed sensor if for the current one a failure is detected
  -estimates airspeed with groundspeed-windspeed if no valid airspeed sensor is present
  -outputs airspeed_validated topic

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

msg/CMakeLists.txt

@@ -38,6 +38,7 @@ set(msg_files
 	actuator_outputs.msg
 	adc_report.msg
 	airspeed.msg
+	airspeed_validated.msg
 	battery_status.msg
 	camera_capture.msg
 	camera_trigger.msg