Move API to use JSON:API standards and fractal serializer

Makes the data slightly more complex, but forces a standard and can
always be changed down the road simply by changing the default
serializer.

app/Http/Controllers/API/User/CoreController.php

@@ -27,7 +27,7 @@ namespace Pterodactyl\Http\Controllers\API\User;
 use Fractal;
 use Illuminate\Http\Request;
 use Pterodactyl\Http\Controllers\Controller;
-use Pterodactyl\Transformers\User\ServerTransformer;
+use Pterodactyl\Transformers\User\OverviewTransformer;
 
 class CoreController extends Controller
 {
@@ -41,6 +41,9 @@ class CoreController extends Controller
     {
         $servers = $request->user()->access('service', 'node', 'allocation', 'option')->get();
 
-        return Fractal::collection($servers)->transformWith(new ServerTransformer)->toArray();
+        return Fractal::collection($servers)
+            ->transformWith(new OverviewTransformer)
+            ->withResourceName('server')
+            ->toArray();
     }
 }