Switch to use small icon for most app related pages

- Renamed AppProgressPreference to AppPreference to handle most app
  related prefs
- Add ed AppSwitchPreference - the same layout as AppPreference except
  it's a SwitchPreference
- Use above 2 prefs in most app related pages.
  - Everything under special access pages
  - Recent app list in App & notifications
  - App data usage detail page
  - Default app picker pages

Bug: 65182905
Test: robotests
Change-Id: I96c980ba1db49e36dabe25b5eade1197215aad11

src/com/android/settings/applications/ProcessStatsPreference.java

@@ -18,14 +18,13 @@ package com.android.settings.applications;
 
 import android.content.Context;
 import android.content.pm.PackageManager;
-import android.graphics.drawable.ColorDrawable;
 import android.text.TextUtils;
 import android.text.format.Formatter;
 
 import android.util.Log;
-import com.android.settings.AppProgressPreference;
+import com.android.settings.widget.AppPreference;
 
-public class ProcessStatsPreference extends AppProgressPreference {
+public class ProcessStatsPreference extends AppPreference {
     static final String TAG = "ProcessStatsPreference";
 
     private ProcStatsPackageEntry mEntry;