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

www/lib/smarty-4.1.0/libs/plugins/modifiercompiler.noprint.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+/**
+ * Smarty noprint modifier plugin
+ * Type:     modifier
+ * Name:     noprint
+ * Purpose:  return an empty string
+ *
+ * @author Uwe Tews
+ * @return string with compiled code
+ */
+function smarty_modifiercompiler_noprint()
+{
+    return "''";
+}