Settings: Allow choice of screen-off animation (2/2)

Adds a choice of alternative screen-off animations:

- Fade out
- Electron beam (default)
- Scale down

Change-Id: I50e7c1d5989cc6004cf635af11e0f775cdd21f0c
[2/2] Settings: Battery Icons

      Reveal hidden battery option

Change-Id: I256a7e52e40b9e581bd85cb5996070f0488d95a6