* Remove unused classes, methods, interfaces, imports
* Reorder imports
* Add final where applicable
* Fix line lengths
* Use local variables where possible
* Replace deprecated Vibrator.vibrate(long) with the successor
* Simplify conditions where they are always met
* Rearrange tags and remove unused schemas in resources
* Merge ScreenReceiver into the service
-> a separate, instantiated but never called-into class makes
one think it's unused
Change-Id: I05cff7ecaf424c166fedceb1f4f8963164c6085a
Targeting S+ (version 31 and above) requires that an explicit value
for android:exported be defined when intent filters are present
Change-Id: I2ce2b2cd1dcd69e343ae8577587483b19d825fdc
