UPGRADE FROM 5.x to 6.0

FrameworkBundle

Removed MicroKernelTrait::configureRoutes().
Made MicroKernelTrait::configureRouting() abstract.

HttpFoundation

Removed Response::create(), JsonResponse::create(), RedirectResponse::create(), and StreamedResponse::create() methods (use __construct() instead)

Routing

Removed RouteCollectionBuilder.