introduce classes for token list and token types

lib/TokenHousenumber.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Nominatim\Token;
+
+/**
+ * A house number token.
+ */
+class HouseNumber
+{
+    public $iId;
+    public $sToken;
+
+    public function __construct($iId, $sToken)
+    {
+        $this->iId = $iId;
+        $this->sToken = $sToken;
+    }
+
+    public function debugInfo()
+    {
+        return array(
+                'ID' => $this->iId,
+                'Type' => 'house number',
+                'Info' => array('nr' => $this->sToken)
+               );
+    }
+}