Update codebase to L5.4 (#367)

app/Http/Kernel.php

@@ -13,12 +13,9 @@ class Kernel extends HttpKernel
      */
     protected $middleware = [
         \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
-        \Pterodactyl\Http\Middleware\EncryptCookies::class,
-        \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
-        \Illuminate\Session\Middleware\StartSession::class,
-        \Illuminate\View\Middleware\ShareErrorsFromSession::class,
-
-        \Pterodactyl\Http\Middleware\LanguageMiddleware::class,
+        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
+        \Pterodactyl\Http\Middleware\TrimStrings::class,
+        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
         \Fideloper\Proxy\TrustProxies::class,
     ];
 
@@ -35,6 +32,7 @@ class Kernel extends HttpKernel
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \Pterodactyl\Http\Middleware\VerifyCsrfToken::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
+            \Pterodactyl\Http\Middleware\LanguageMiddleware::class,
         ],
         'api' => [
             'throttle:60,1',