Notifications fixes (#804)

* Emails not sending #795 #722

* Fix for news items not being sent; refactor some events; check for opt-in #722

* Formatting

* Remove extra parameter

app/Events/CronNightly.php

@@ -2,10 +2,12 @@
 
 namespace App\Events;
 
+use App\Contracts\Event;
+
 /**
  * This event is dispatched when the daily cron is run
  * It happens after all of the default nightly tasks
  */
-class CronNightly extends BaseEvent
+class CronNightly extends Event
 {
 }