Settings: Do not disturb automatic rule updates.

- Remove FAB for adding rules, move to last preference.
 - Add first-class event condition type and config sub-page.
 - Always show radio buttons when adding rules.
 - Add new data model for event rules.
 - Add stub condition provider for event rules (always false for now).
 - Add rule-type icons to rule preference rows.

Bug: 20064962
Change-Id: Id5acde371eb2e7d22b1f195459897614db5ba80a

src/com/android/settings/Settings.java

@@ -99,6 +99,7 @@ public class Settings extends SettingsActivity {
     public static class ZenModePrioritySettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeAutomationSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeScheduleRuleSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class ZenModeEventRuleSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ZenModeExternalRuleSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationSettingsActivity extends SettingsActivity { /* empty */ }
     public static class NotificationAppListActivity extends SettingsActivity { /* empty */ }