Add new message format (fix #63)

traccar-client/src/main/res/xml/preferences.xml

@@ -33,6 +33,12 @@
         android:summary="@string/settings_provider_summary"
         android:title="@string/settings_provider_title" />
 
+    <CheckBoxPreference
+        android:defaultValue="false"
+        android:key="extended"
+        android:summary="@string/settings_extended_summary"
+        android:title="@string/settings_extended_title" />
+
     <CheckBoxPreference
         android:defaultValue="false"
         android:key="status"