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>

src/lib/AirspeedValidator/AirspeedValidator.hpp

@@ -99,7 +99,7 @@ public:
 
 	void set_wind_estimator_beta_gate(uint8_t gate_size) { _wind_estimator.set_beta_gate(gate_size); }
 	void set_wind_estimator_scale_estimation_on(bool scale_estimation_on) {_wind_estimator_scale_estimation_on = scale_estimation_on;}
-	void set_airspeed_scale(float airspeed_scale_manual) { _wind_estimator.enforce_airspeed_scale(airspeed_scale_manual);}
+	void set_airspeed_scale(float airspeed_scale_manual) { _wind_estimator.enforce_airspeed_scale(1.0f / airspeed_scale_manual);} // scale is inverted inside the wind estimator
 
 	// setters for failure detection tuning parameters
 	void set_tas_innov_threshold(float tas_innov_threshold) { _tas_innov_threshold = tas_innov_threshold; }