Quiet Hours: allow disabling of system sounds (1 of 2)

* this include touch and lockscreen sounds

Change-Id: I4b16be00ae24dafd0039834bf63f6df3ef918619

Conflicts:
	core/java/android/provider/Settings.java
QuietHours: clean up and consolidate code

Change-Id: Ib745ba91f800489518f1c7b5d2512ba946039696

Conflicts:
	services/java/com/android/server/BatteryService.java
	services/java/com/android/server/NotificationManagerService.java
	services/java/com/android/server/VibratorService.java