Framework: Allow choice of screen-off animation (1/2)

Adds a choice of alternative screen-off animations:

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

Change-Id: I8ec9bfc6248a1223037fd252b0c853db7994afe6

Conflicts:
	core/java/android/provider/Settings.java
[1/2] Frameworks: Battery Icons

      Reveal hidden battery option
      Remove all customizations; return to stock design

Change-Id: I026daf0e2b75c8cf9923ed28ef02289813cfdb50