Implemented plugin architecture.

libs/plugins/modifier.lower.php

@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * Smarty plugin
+ * -------------------------------------------------------------
+ * Type:     modifier
+ * Name:     lower
+ * Purpose:  convert string to lowercase
+ * -------------------------------------------------------------
+ */
+function smarty_modifier_lower($string)
+{
+	return strtolower($string);
+}
+
+?>