Upgrade logging to use Events

add_to_log has been deprecated since Moodle 2.7.  This patch adds an event
and triggers it instead of calling add_to_log; a version bump is included
in order to register the event class.

Author: pauln

classes/event/course_module_viewed.php

@@ -0,0 +1,10 @@
+<?php
+namespace mod_echolink\event;
+defined('MOODLE_INTERNAL') || die();
+class course_module_viewed extends \core\event\course_module_viewed {
+    protected function init() {
+        $this->data['crud'] = 'c';
+        $this->data['edulevel'] = self::LEVEL_PARTICIPATING;
+        $this->data['objecttable'] = 'echolink';
+    }
+}

view.php

@@ -47,8 +47,14 @@
 $context = context_module::instance($cm->id);
 require_capability('mod/echolink:view', $context);
 
-add_to_log($course->id, 'echolink', 'view', 'view.php?id='.$cm->id, $echolink->id, $cm->id);
-
+// Log this request.
+$params = array(
+    'objectid' => $course->id,
+    'context' => $context
+);
+$event = \mod_echolink\event\course_module_viewed::create($params);
+$event->add_record_snapshot('echolink', $echolink);
+$event->trigger();
 
 // Update 'viewed' state if required by completion system
 $completion = new completion_info($course);