OP-1317 Low-pass filter parameters added to airpeedSettings: IMUBasedEstimationLowPassPeriod1 pre-filter period in seconds, IMUBasedEstimationLowPassPeriod2 filter period in seconds. Oscillations with shorter periods than these, are filtered. If airspeed has too much noise increase IMUBasedEstimationLowPassPeriod2, else if it is too smooth descrease it.