Symfony 8.0: Switch configuration from XML to PHP

[ThomasLandauer]

See https://symfony.com/blog/new-in-symfony-7-4-deprecated-xml-configuration - there's also a tool for automatic conversion.

[isometriks]

I can take a look at this soon, and your last issue, unless you want to open a PR for it. Haven't used Symfony in a bit but shouldn't be too hard to make a new project and test this out