[1.7.0] Implement and hook-in Tidy module setup.

- CommonAttributes factored into XMLCommonAttributes and NonXMLCommonAttributes
- Tidy abstract module was completely refactored in interest of usability
- Add friendly error message if module does not have name

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1070 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/HTMLModule/XMLCommonAttributes.php

@@ -0,0 +1,16 @@
+<?php
+
+require_once 'HTMLPurifier/HTMLModule.php';
+
+class HTMLPurifier_HTMLModule_XMLCommonAttributes extends HTMLPurifier_HTMLModule
+{
+    var $name = 'XMLCommonAttributes';
+    
+    var $attr_collections = array(
+        'Lang' => array(
+            'xml:lang' => 'LanguageCode',
+        )
+    );
+}
+
+?>