Reorganised code layout

Separated class library and web interface code
Added a common config/database config to be referenced by all
subprojects

Fixed previous commit

webui/pages/errors/404.php

@@ -0,0 +1,9 @@
+<?php
+
+$main = HandBrakeCluster_Main::instance();
+$req  = $main->request();
+
+$this->smarty->assign('requested_page', htmlspecialchars($req->request_string()));
+
+
+?>