C4 003 Adaption towards Contao 5

[Ernestopheles]

Next adaption towards Contao 5.

See useCases tested with cypress: tests
Contao 4.13.31, Isotope 2.9 and PHP 8.1

[fritzmg]

Instead of calling

System::getContainer()->get('contao.routing.scope_matcher')
System::getContainer()->get('request_stack')

every time I think you should put

$container = System::getContainer();
$scopeMatcher = $container->get('contao.routing.scope_matcher');
$requestStack = $container->get('request_stack');

At the beginning of the file and then re-use the variables.

[Ernestopheles]

Thank you, @fritzmg, absolutely right

[Ernestopheles]

I replaced this PR by PR C4 004