Application restrictions UI

Refactored User Settings UI to have two types of users.
Display a list of apps to select.
Edit user restrictions.
Handle saving and updating RestrictionEntry items via
User Manager.

Change-Id: I3ad5aa71d5ef66dffd39e17ba0556f075ac10a0f

res/layout/preference_rename_widget.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 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.
+-->
+
+<!-- Layout for a text label in the user limits screen. -->
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:text="@string/user_rename" />