[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/Id.php

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Represents a directive ID in the interchange format.
+ */
+class HTMLPurifier_ConfigSchema_Interchange_Id
+{
+    
+    public $namespace, $directive;
+    
+    public function __construct($namespace, $directive) {
+        $this->namespace = $namespace;
+        $this->directive = $directive;
+    }
+    
+    public function __toString() {
+        return $this->namespace . '.' . $this->directive;
+    }
+    
+    public static function make($id) {
+        list($namespace, $directive) = explode('.', $id);
+        return new HTMLPurifier_ConfigSchema_Interchange_Id($namespace, $directive);
+    }
+    
+}