add smarty lib

libs/sysplugins/smartyexception.php

@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * Smarty exception class
+ *
+ * @package Smarty
+ */
+class SmartyException extends Exception
+{
+    public static $escape = false;
+
+    public function __toString()
+    {
+        return ' --> Smarty: ' . (self::$escape ? htmlentities($this->message) : $this->message) . ' <-- ';
+    }
+}