MDL-37624 calendar: Added location support

calendar/export_execute.php

@@ -211,6 +211,11 @@ foreach($events as $event) {
 
     $ev->add_property('class', 'PUBLIC'); // PUBLIC / PRIVATE / CONFIDENTIAL
     $ev->add_property('last-modified', Bennu::timestamp_to_datetime($event->timemodified));
+
+    if (!empty($event->location)) {
+        $ev->add_property('location', $event->location);
+    }
+
     $ev->add_property('dtstamp', Bennu::timestamp_to_datetime()); // now
     if ($event->timeduration > 0) {
         //dtend is better than duration, because it works in Microsoft Outlook and works better in Korganizer