Settings, about and menu
 - Add SettingsActivity and xml
 - Add AboutActivity
 - Add main menu
 - Add preference strings and arrays
 - Add new version off libZeitmesser
Add additional lifecycle methods
MainActivity now uses onStart, onStop, onPause and onResume.
DigitalDisplay dev tool check.
Resolve rendering problem in development tools.
Tile design
New libZeitmesser.jar
Bugfix
New lap design.
Dark theme.