Use Drawer in Settings app

- get rid of PreferenceActivity as much as we can and use fragments instead
- add Drawer widget
- add Dashboard high level entry into the Drawer (but this is work in progress and would be done in another CL)
- add bypass of fragment's Header  validation when launched from the Drawer but *force* validation if external
call thru an Intent

Be aware that WifiPickerActivity should remain for now a PreferenceActivity. It is used by SetupWizard and should
not trigger running the SettingsActivity's header building code. SetupWizard is a Home during the provisionnig process
and then deactivate itself as a Home but would make the Home header to appear in the Drawer (because momentarily we
would have two Home).

Also, verified that:

- the WiFi settings still work when called from SetupWizard
- when you have multiple Launchers, the Home header will appear in the list of Headers in the Drawer

Change-Id: I407a5e0fdd843ad7615d3d511c416a44e3d97c90

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

@@ -28,7 +28,6 @@ import android.content.pm.PermissionGroupInfo;
 import android.content.pm.PermissionInfo;
 import android.content.res.Resources;
 import android.os.Bundle;
-import android.preference.PreferenceActivity;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -40,6 +39,7 @@ import android.widget.Switch;
 import android.widget.TextView;
 
 import com.android.settings.R;
+import com.android.settings.SettingsActivity;
 import com.android.settings.Utils;
 
 import java.util.List;
@@ -161,8 +161,8 @@ public class AppOpsDetails extends Fragment {
     private void setIntentAndFinish(boolean finish, boolean appChanged) {
         Intent intent = new Intent();
         intent.putExtra(ManageApplications.APP_CHG, appChanged);
-        PreferenceActivity pa = (PreferenceActivity)getActivity();
-        pa.finishPreferencePanel(this, Activity.RESULT_OK, intent);
+        SettingsActivity sa = (SettingsActivity)getActivity();
+        sa.finishPreferencePanel(this, Activity.RESULT_OK, intent);
     }
 
     /** Called when the activity is first created. */