Moved the UI to a Fragment implemented in GameFragment for simpler state
retainment.
Correctly preserve all state except pause overlay visibility (TODO) across configuration changes
order string resources alphabetically
fix time selection dialog
removed unused import statements
use a private handler class instead of anonymous

Declares a custom inner class in Player.java, which holds a WeakReference
to the corresponding Player object. This allows the Player object to be
garbage collected. fixes #6
removed some unused variables