Clean up notification settings

- Reorganize settings
- Fix dividers
- Add icons
- Fix titles
- Fix colors
- Fix indentation
- Add summaries

Fixes: 190079590
Test: manual inspection, robotests

Change-Id: Ia03219575d3b0c78f9f9b088aa3cdaa29cfdf412

res/drawable/ic_notification_vis_override.xml

@@ -0,0 +1,25 @@
+<!--
+    Copyright (C) 2021 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        android:tint="?android:attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M17,1.01L7,1c-1.1,0 -2,0.9 -2,2v18c0,1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2L19,3c0,-1.1 -0.9,-1.99 -2,-1.99zM17,21L7,21v-1h10v1zM17,18L7,18L7,6h10v12zM7,4L7,3h10v1L7,4zM14.25,10.5v-0.66c0,-1.13 -1.03,-2.09 -2.25,-2.09s-2.25,0.96 -2.25,2.09v0.66L9,10.5L9,16h6v-5.5h-0.75zM12.75,10.5h-1.5v-0.66c0,-0.29 0.38,-0.59 0.75,-0.59s0.75,0.3 0.75,0.59v0.66z"/>
+</vector>