Re: [geolocation-sensor] Barometer altitude (if the device has barometer) (#43)

@anssiko  I understand you concerns. Having separate info from every sensor (if present) should work in this use case. 
Generally in foreground operation there will be no issue as we can get what ever sensor data. But, my concern is background operation, I do not know the background operation api details, but if we are able to subscribe multiple sensor info for background operation it should be enough to do every use case.

So here are more detailed use cases:

- Using the barometric altitude and GPS altitude to check the participants air-space violations.
- Using the barometric altitude for  vertical speed calculation but we need the Accelerometer and Gyroscope sensors for noise cancellation. But we want to log these data among the flight for later reference.
- Producing acoustic when the vertical speed is higher or lower than a threshold to notify the pilot.

Of course we need the user confirmation to do the above tasks.

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