Add upstream plugins

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

wp-content/plugins/all-in-one-event-calendar/lib/database/exception/schema.php

@@ -0,0 +1,14 @@
+<?php
+
+/**
+ * In case of database schema modification failure this exception is thrown
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Database.Exception
+ */
+class Ai1ec_Database_Schema_Exception extends Ai1ec_Exception
+{
+}