Android: Raise target Android SDK Version to 19

Enable support for Android KitKat features
Android: Enable Immersive Full-Screen Mode

Enable sticky immersive mode for Android KitKat devices to hide the
navigation bar which is shown for Android KitKat devices without
hardware navigation keys.
Renderer/ChartRenderer: Allow specifying alternative text for "No Data"
CrossSection/CrossSectionRenderer: Display "Not moving" if content can't be drawn

Implements trac enhancement request #3312.
Driver: Added basic OpenVario driver
CSVLine: Added IsEmpty() method
OpenVario: Added static pressure support
OpenVario: Added dynamic pressure support
OpenVario: Added total pressure support
OpenVario: Added unit test for multiple datapoints in one sentence
OpenVario: Added temperature support
OpenVario: Added airspeed support
OpenVario: Added driver to register
OpenVario: Added TE vario support
OpenVario: Added unit test for TE vario support