Settings: Update to follow new volume design.

- "Sound & Notification"  (not Notifications)
- Remove ringer-mode pref.
- Add zen-mode pref to renamed "Interruptions" screen.
- Implement two separate "Sound" & "Notification" sections.
- Remove "Showing notifications" screen, migrate settings.
- Remove custom category styling now that we have a platform style.
- Implement new "days" sleep mode and corresponding dialog pref.
- Corresponding changes to indexable resources.

Associated frameworks/base change:
  I35afe38646f04d2ba0dbac11c2c6356120a33694

Bug:15831713
Change-Id: I6ed56791784968adfbd684f490dbbebed285a2dd

src/com/android/settings/search/Ranking.java

@@ -36,7 +36,6 @@ import com.android.settings.fuelgauge.PowerUsageSummary;
 import com.android.settings.inputmethod.InputMethodAndLanguageSettings;
 import com.android.settings.location.LocationSettings;
 import com.android.settings.net.DataUsageMeteredSettings;
-import com.android.settings.notification.NotificationDisplaySettings;
 import com.android.settings.notification.NotificationSettings;
 import com.android.settings.notification.OtherSoundSettings;
 import com.android.settings.notification.ZenModeSettings;
@@ -108,7 +107,6 @@ public final class Ranking {
 
         // Notifications
         sRankMap.put(NotificationSettings.class.getName(), RANK_NOTIFICATIONS);
-        sRankMap.put(NotificationDisplaySettings.class.getName(), RANK_NOTIFICATIONS);
         sRankMap.put(OtherSoundSettings.class.getName(), RANK_NOTIFICATIONS);
         sRankMap.put(ZenModeSettings.class.getName(), RANK_NOTIFICATIONS);