Adding Urldecode filter

lib/Haanga/lib/Haanga/Extension/Filter/Urldecode.php

+<?php
+
+class Haanga_Extension_Filter_UrlDecode
+{
+
+    public static function generator($cmp, $args)
+    {
+        $cmp->var_is_safe = TRUE;
+        return hexec('urldecode', $args[0]);
+    }
+}