All versions of ixGyro Glass Cockpit Demo

- Bug fixed for devices without GPS - Bug fix with external iLevil devices - Support of Android 5 devices - Support of all external iLevil sensor devices via WiFi - Setting for changing the gyro sampling rate - Problems with no-phone devices solved - Selectable units for ground speed (km/h, knots, mph), vertical speed (m/s, hundred feet per minute), and altitude (m, feet) - Switch for GPS based attitude correction - Improved Kalman algorithm for robust pitch/roll calculation