OmniGears: add expanded desktop settings

Add Immersive mode, based on Dirty Unicorns Expanded desktop
http://gerrit.dirtyunicorns.com/#/c/2025/

Includes fixes from @Mazda--

Change-Id: Ied76fe53f863f375b9d7431f35ba4d7a75d74566
diff --git a/res/xml/bars_settings.xml b/res/xml/bars_settings.xml
index 531b661..c86e3a7 100644
--- a/res/xml/bars_settings.xml
+++ b/res/xml/bars_settings.xml
@@ -81,6 +81,18 @@
         </PreferenceCategory>
 
         <PreferenceCategory
+            android:key="expanded_desktop_category"
+            android:title="@string/expanded_desktop_title">
+
+            <Preference
+                android:key="expanded_desktop_category"
+                android:title="@string/expanded_desktop_title"
+                android:summary="@string/expanded_desktop_summary"
+                android:fragment="org.omnirom.omnigears.interfacesettings.ExpandedDesktop" />
+
+        </PreferenceCategory>
+
+        <PreferenceCategory
             android:key="lockscreen_category"
             android:title="@string/lockscreen_category_title" >