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/Notifications/BaseNotification.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Notification;
+use Illuminate\Support\Facades\Log;
+
+class BaseNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public $channels = [];
+
+    public function __construct()
+    {
+        // Look in the notifications.channels config and see where this particular
+        // notification can go. Map it to $channels
+        $klass = get_class($this);
+        $notif_config = config('notifications.channels', []);
+        if (!array_key_exists($klass, $notif_config)) {
+            Log::error('Notification type '.$klass.' missing from notifications config');
+            return;
+        }
+
+        $this->channels = $notif_config[$klass];
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param mixed $notifiable
+     *
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return $this->channels;
+    }
+}