Split util into two file:

- util.js that contains essential functions
 - webutils.js that contains the GUI utility function.js

this helps to include noVNC in other project, especially Cappuccino Application
i

tests/wsencoding.html

@@ -24,6 +24,7 @@
 
     <script src="include/base64.js"></script>
     <script src="include/util.js"></script>
+    <script src="include/webutil.js"></script>
 
     <script>