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

resources/views/notifications/mail/news/news.blade.php

@@ -0,0 +1,12 @@
+@component('mail::message')
+# {{ $news->subject }}
+
+$news->body
+
+@component('mail::button', ['url' => route('frontend.pireps.show', [$pirep->id])])
+View PIREP
+@endcomponent
+
+Thanks,<br>
+{{ config('app.name') }}
+@endcomponent