Begin work on holochron 2
holochron 2 is a complete rewrite of holochron.
Add buttons and backend.
 - Add start/stop and reset/lap buttons
 - Add a libZeitmesser Watch instance
 - Complete DigitalDisplay class
 - move classes to subpackages
Lap recording
Improve lap representation.
Add copyright header to java files.
Rename holochron package.
Rename "de.lenidh.android.holochron2" to "de.lenidh.android.holochron".
Merge local branches.
 - Copyright header
 - Rename holochron package
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.
Dark theme.
Lap numbers
Lap numbers are determined by record order.
Install location.
Enable external storage installation.
Resume on orientation change.
Fix some warnings.