Added feature to the HTML manual to remember your preference to show or hide the inheritance diagram (shown by default now).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53235 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/htmlfooter.inc

@@ -16,6 +16,8 @@
 </tr>
 </table>
 
+<script src="wxwidgets.js" type="text/javascript"></script>
+
 </body>
 </html>