391 Notification refactorings (#441)

* Refactor notifications to allow easier plugins

* Notification refactoring

* Formatting

* Move news to NewsService; cleanup of events

* More refactoring; added send email out for news item and the template

* Formatting

* Formatting

app/Events/BaseEvent.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Events;
+
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class BaseEvent
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+}