Wind direction should be sampled and report the median

[ctacke]

Right now the Clima samples wind direction periodically (one a minute) and reports direction. Physically I see it moving a whole lot, so that number is going to be poor for accuracy. We should probably sample more frequently and return a something more like a rolling-median average of direction.

[doingnz]

do you want to close this issue? Clima_Demo application is reporting the mean of 12 samples.

    private readonly CircularBuffer<Azimuth> windVaneBuffer = new CircularBuffer<Azimuth>(12);
...
    private void WindvaneUpdated(object sender, IChangeResult<Azimuth> e)
    {
        windVaneBuffer.Append(e.New);

        lock (latestData)
        {
            latestData.WindDirection = windVaneBuffer.Mean();
        }

        Resolver.Log.InfoIf(LogSensorData, $"Wind Vane:       {e.New.DecimalDegrees} (mean: {windVaneBuffer.Mean().DecimalDegrees})");
    }