Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/lib/rewrite/helper.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Rewrite helper class.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Rewrite
+ */
+class Ai1ec_Rewrite_Helper {
+
+    /**
+     * Remove rewrite rules and then recreate rewrite rules.
+     *
+     * @param bool $hard Whether to update .htaccess (hard flush) or just update
+     *     rewrite_rules transient (soft flush). Default is true (hard).
+     */
+    public function flush_rewrite_rules( $hard = true ) {
+        flush_rewrite_rules( $hard );
+    }
+}