Support different rewrite levels for XE compatibility

common/framework/router.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Rhymix\Framework;
+
+/**
+ * The router class.
+ */
+class Router
+{
+    /**
+     * Return the currently configured rewrite level.
+     * 
+     * 0 = None
+     * 1 = XE-compatible rewrite rules only
+     * 2 = Full rewrite support
+     * 
+     * @return int
+     */
+    public static function getRewriteLevel(): int
+    {
+        $level = Config::get('url.rewrite');
+        if ($level === null)
+        {
+            $level = Config::get('use_rewrite') ? 1 : 0;
+        }
+        return intval($level);
+    }
+}