Init php 7 compatibility (#399)

A first approach at fixing s9y for php 7, which makes it possible to
write an entry without any error message. The specific changes are: 1.
__construct for the plugin classes 2. Update Cache Lite to a modern
version to fix its similar constructor problem 3. Remove the
session_regenerate_id call from the session destructor (should get
re-added to session creation where necessary) 4. Remove error handler to
prevent silenced warnings from becoming fatal exceptions

bundled-libs/Cache/Lite/Output.php

@@ -7,11 +7,10 @@
 * Technical choices are described in the 'docs/technical' file
 *
 * @package Cache_Lite
-* @version $Id: Output.php,v 1.4 2006/01/29 00:22:07 fab Exp $
 * @author Fabien MARTY <fab@php.net>
 */
 
-require_once dirname(__FILE__) . '/../Lite.php';
+require_once('Cache/Lite.php');
 
 class Cache_Lite_Output extends Cache_Lite
 {
@@ -67,6 +66,3 @@ class Cache_Lite_Output extends Cache_Lite
     }
 
 }
-
-
-?>