[3.1.0] De-crudify the ConfigSchema space; we're starting over again

- Optimize ConfigSchema by removing non-essential runtime data. We can probably optimize even more by collapsing object structures to arrays.
- Removed validation data from ConfigSchema; this will be reimplemented on Interchange
- Implement a sane Interchange composite hierarchy that doesn't use arrays
- Implement StringHash -> Interchange -> ConfigSchema, and rewrite maintenance file to account for this

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1615 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/Interchange/Namespace.php

@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * Interchange component class describing namespaces.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Namespace
+{
+    
+    /**
+     * Name of namespace defined.
+     */
+    public $namespace;
+    
+    /**
+     * HTML description.
+     */
+    public $description;
+    
+}