Investigate and fix Magnetometer reading differences between Android and iOS

Currently – as the Sensors Showcase example made visible – the magnetometer reading values don't behave as expected on iOS. On Android the values can indicate the magnetic north, and the readings change if a magnetic field is nearby, however on iOS processing the values the same way as on Android doesn't result in a generic magnetic north direction and the same amount of changes in the presence of another magnetic field. The task is about to investigate the reasons and achieve the same or similar readings on both platforms.