Add iCal functionality

plugins/zapcal/includes/framework.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * framework.php - framework file
+ *
+ * @package	ZapCalLib
+ * @author	Dan Cogliano <http://zcontent.net>
+ * @copyright   Copyright (C) 2006 - 2017 by Dan Cogliano
+ * @license     GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
+ * @link	http://icalendar.org/php-library.html
+ */
+
+// No direct access
+defined('_ZAPCAL') or die( 'Restricted access' );
+
+/**
+ * set MAXYEAR to 2036 for 32 bit systems, can be higher for 64 bit systems
+ *
+ * @var integer
+ */
+define('_ZAPCAL_MAXYEAR', 2036);
+
+/**
+ * set MAXREVENTS to maximum # of repeating events 
+ *
+ * @var integer
+ */
+define('_ZAPCAL_MAXREVENTS', 5000);
+
+require_once(_ZAPCAL_BASE . '/includes/date.php');
+require_once(_ZAPCAL_BASE . '/includes/recurringdate.php');
+require_once(_ZAPCAL_BASE . '/includes/ical.php');
+require_once(_ZAPCAL_BASE . '/includes/timezone.php');