App-level notification configuration settings page.

New sub-page off of notification settings to ban/unban
apps and navigate to an app's notification configuration
activity (if configured).

Centralized all notification settings artifacts under a new
settings subpackage.

Bug: 13935172
Change-Id: I53b75c02f0091900734d17dc9217035d0df9b466

res/layout/notification_app_section.xml

@@ -0,0 +1,19 @@
+<!--
+     Copyright (C) 2014 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    style="?android:attr/listSeparatorTextViewStyle"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content" />