EKF and AirspeedSelector: publish multiple wind estimate topic instances

[sfuhrer]

This PR fixes the publication of multiple wind estimate instances (multiple wind estimates from the airspeed validation module, one from ekf2)

[dagar]

Would it be worth adding some simple identifier to know where each is originating?

[sfuhrer]

Would it be worth adding some simple identifier to know where each is originating?

@dagar Would be useful I guess, yes. If you know your way around it's also possible now (e.g. the EKF wind has a scale of 0).
Do you mean adding an integer as identifier? E.g. 0=EKF wind, 1=beta fused only, 2= with data from airspeed sensor 1, 3=from sensor 2, ..

[dagar]

Yes, although the bigger question is which to actually use in a controller or even to send to the ground over mavlink.