Convert static Session class to normal session class

All static Session:: calls (except for checking valid session name) are
converted to object type. This Object is passed on to Login, Admin
Backend and any other class that needs basic session checking

www/admin/class_test.json.php

@@ -21,10 +21,6 @@ ob_start();
 define('USE_DATABASE', false);
 // sample config
 require 'config.php';
-// set session name
-if (!defined('SET_SESSION_NAME')) {
-	define('SET_SESSION_NAME', EDIT_SESSION_NAME);
-}
 // define log file id
 $LOG_FILE_ID = 'classTest-json';
 ob_end_flush();