Added HTMLPurifier (http://htmlpurifier.org/) Version 3.3.0

- can be used via html class like: 

        $clean_html = html::purify($html);

- using it now in eTemplate to remove malicious code from html:
  a) when displaying "formatted text"
  b) when "formatted text" get's input by the user

phpgwapi/inc/htmlpurifier/library/HTMLPurifier/HTMLModule/Bdo.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * XHTML 1.1 Bi-directional Text Module, defines elements that
+ * declare directionality of content. Text Extension Module.
+ */
+class HTMLPurifier_HTMLModule_Bdo extends HTMLPurifier_HTMLModule
+{
+
+    public $name = 'Bdo';
+    public $attr_collections = array(
+        'I18N' => array('dir' => false)
+    );
+
+    public function setup($config) {
+        $bdo = $this->addElement(
+            'bdo', 'Inline', 'Inline', array('Core', 'Lang'),
+            array(
+                'dir' => 'Enum#ltr,rtl', // required
+                // The Abstract Module specification has the attribute
+                // inclusions wrong for bdo: bdo allows Lang
+            )
+        );
+        $bdo->attr_transform_post['required-dir'] = new HTMLPurifier_AttrTransform_BdoDir();
+
+        $this->attr_collections['I18N']['dir'] = 'Enum#ltr,rtl';
+    }
+
+}
+
+// vim: et sw=4 sts=4