Add upstream plugins

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

wp-content/plugins/all-in-one-event-calendar/lib/import-export/interface/import-export-engine.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * The basic import/export interface.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Import-export.Interface
+ */
+interface Ai1ec_Import_Export_Engine {
+
+    /**
+     * This methods allow for importing of events.
+     *
+     * @param array $arguments An array of arguments needed for parsing.
+     *
+     * @throws Ai1ec_Parse_Exception When the data passed is not parsable
+     *
+     * @return int The number of imported events.
+     */
+    public function import( array $arguments );
+
+    /**
+     * This methods allow exporting events.
+     *
+     * @param array $arguments An array of arguments needed for exporting.
+     * @param array @params    An array of export parameters.
+     *
+     * @return void It doesn't return anything.
+     */
+    public function export( array $arguments, array $params = array() );
+}

wp-content/plugins/all-in-one-event-calendar/lib/import-export/interface/import-export-service-engine.php

@@ -0,0 +1,20 @@
+<?php
+
+/**
+ * The import/export interface for external services.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Import-export.Interface
+ */
+interface Ai1ec_Import_Export_Service_Engine
+    extends Ai1ec_Import_Export_Engine {
+
+    /**
+     * Register everything the interface needs into core.
+     */
+    public function register_settings();
+
+}