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/ConfirmLockPattern.java

@@ -27,7 +27,6 @@ import android.content.Intent;
 import android.os.CountDownTimer;
 import android.os.SystemClock;
 import android.os.Bundle;
-import android.preference.PreferenceActivity;
 import android.widget.TextView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -41,7 +40,7 @@ import java.util.List;
  * Sets an activity result of {@link Activity#RESULT_OK} when the user
  * successfully confirmed their pattern.
  */
-public class ConfirmLockPattern extends PreferenceActivity {
+public class ConfirmLockPattern extends SettingsActivity {
 
     /**
      * Names of {@link CharSequence} fields within the originating {@link Intent}
@@ -65,7 +64,7 @@ public class ConfirmLockPattern extends PreferenceActivity {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         CharSequence msg = getText(R.string.lockpassword_confirm_your_pattern_header);
-        showBreadCrumbs(msg, msg);
+        setTitle(msg);
     }
 
     @Override