Upgrade from Smarty 3 to Smarty 4 to be PHP 8.1 compatible

Remove all Smarty4 dedicated tests, all are done in the same test file
like before

phpstan-bootstrap.php

@@ -4,7 +4,7 @@
 // sets the _SERVER['HTTP_HOST'] var so we can have DB detection
 $_SERVER['HTTP_HOST'] = 'soba.tokyo.tequila.jp';
 // so www/includes/edit_base.php works
-require_once('www/lib/Smarty/SmartyBC.class.php');
+// require_once('www/lib/Smarty/SmartyBC.class.php');
 // for whatever reason it does not load that from the confing.master.php
 // for includes/admin_header.php
 define('BASE_NAME', '');