Make the initialization of PhidgetSpatial tracker faster

[Sunderlandkyl]

Currently, the OrientationSensor and FilteredTiltSensor tools in the PhidgetSpatial tracker require a couple of seconds (or more, depending on the gain value) to converge from the initial orientation to the current orientation. To avoid this artifact, when the first measurement is obtained from the sensor, that measurement data should be used to update the sensor fusion algorithm many times, making that converging to the orientation that corresponds to the current position. This initialization technique is implemented in the SpatialSensorFusion application, so it could be taken from there.

Migrated from https://app.assembla.com/spaces/plus/tickets/791/details