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/input.html

@@ -19,6 +19,7 @@
         src='http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js'></script>
     -->
     <script src="include/util.js"></script>
+    <script src="include/webutil.js"></script> 
     <script src="include/base64.js"></script>
     <script src="include/canvas.js"></script>
     <script>