Add semi-automatic response-modfication

[DASPRiD]

This PR adds the possibility for match results to modify the response object. Specifically, this has the following use case:

When a response is not successful, it can take care of modifying the response object, instead of leaving the application to handle that job. Currently, the following cases are handled:

• On an unsuccessful match, a 404 status code is injected.
• On a method not allowed case, a 405 status code is injected together with an Allow header listing the allowed methods.
• On a scheme not allowed case, a 301 status code is injected together with a Location header pointing to the same URL but with an HTTPS scheme.

Example usage:

$matchResult = $router->match($request);

if (!$matchResult->isSuccess()) {
    $response = $matchResult->modifyResponse($response);
    // Bubble up the response
}

[danizord]

Dislike it - too much responsabilities for a router :(

[DASPRiD]

I kinda agree. This is definitely not the responsibility of the match results. It may still be part of the router, but for now I'll close this and maybe bring it up later again.