Checkpoint of new storage wizards.

Use frameworks/opt/setupwizard/library/ for consistent behavior and
styling on phones and tablets.  Implement every step of wizard flow
and connect them together, even though some steps are currently
non-functional.  All strings to match UX spec, with some adjustment.

Wizards inherit from helper base class.

New interstitials before unmounting or formatting private storage
to confirm user knows consequences.

Bug: 19993667
Change-Id: I2c774e1718d513805ee8aecfc96d066d4730450c

src/com/android/settings/PrivacySettings.java

@@ -204,7 +204,7 @@ public class PrivacySettings extends SettingsPreferenceFragment implements
         if (summary != null) {
             mConfigure.setSummary(summary);
         } else {
-            mConfigure.setSummary(R.string.backup_configure_account_default_summary);
+            //mConfigure.setSummary(R.string.backup_configure_account_default_summary);
         }
     }