Implemented plugin architecture.

plugins/modifier.string_format.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * Smarty plugin
+ * -------------------------------------------------------------
+ * Type:     modifier
+ * Name:     string_format
+ * Purpose:  format strings via sprintf
+ * -------------------------------------------------------------
+ */
+function smarty_modifier_string_format($string, $format)
+{
+    return sprintf($format, $string);
+}
+
+/* vim: set expandtab: */
+
+?>