Base: Option to enable Notification Light when screen is on [1/2]

This makes it possible to let the Notification LED flash even when the screen is on

Conflicts:
	core/java/android/provider/Settings.java
	services/java/com/android/server/NotificationManagerService.java

Conflicts:
	core/java/android/provider/Settings.java

Change-Id: I891295243646e66afc6920bc9367a203337edb77
Merge "Base: Option to enable Notification Light when screen is on [1/2]" into kitkat3