Sound URI management refactoring and fixing in Preferences.
Fixing fallback method and using it also for DawnSound.
Using default alarm as fallback.
Refactoring
Added plural to toast message.
Starting to add week day.
Moving weekday skipping functionality to Alarm.
Removing fallback sound, since we fall back to default anyway.
Added "ext" directory for resources external to the apk.
Moved files from assets to ext dir.
Added feature image.
Bumping version number.
Added explicit support for tablets.