Per-mailbox settings

- Use PreferenceActivity, in the old style, meaning without PreferenceFragment.
- If setting Inbox, change the account settings instead of mailbox settings.
- Use the DialogWhenLarge theme, meaning it's a full-screen avitity on the
  phone and a dialog on the tablet.
- Also fixed the bug that we the menu items that are made invisible by
  UIControllerBase may be made re-visible by the 1-pane controller.

TODO The menu item shouldn't be shown for non-syncable mailboxes.

Change-Id: I02b2faf6f593e1e2eb370217c27801aa58ca7e6c
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6a1cbc2..aeae0cc 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -262,6 +262,13 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".activity.setup.MailboxSettings"
+            android:label="@string/mailbox_settings_activity_title"
+            android:theme="@android:style/Theme.Holo.DialogWhenLarge"
+            >
+        </activity>
+
         <receiver
             android:name=".service.AttachmentDownloadService$Watchdog"
             android:enabled="true"/>