Use Notification/Notifiable (#379)

* Add migrations for notifiables

* Configure spatie-backup to run as part of cron

* Convert Mailer to Notification; add pirep notifications

* Styling

app/Database/migrations/2019_08_30_132224_create_notifications_table.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateNotificationsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('notifications', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->string('type');
+            $table->morphs('notifiable');
+            $table->text('data');
+            $table->timestamp('read_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('notifications');
+    }
+}

app/Database/seeds/settings.yml

@@ -11,7 +11,7 @@
   value: ''
   options: ''
   type: text
-  description: 'Email where notices, etc are sent'
+  description: 'Email where system notices, etc are sent'
 - key: general.check_prerelease_version
   name: 'Pre-release versions in version check'
   group: general