…onfiguration in core (fabpot)This PR was merged into the 5.2-dev branch.Discussion----------Use PHP instead of XML as the prefered service/route configuration in core| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes-ish <!-- please update src/**/CHANGELOG.md files -->| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tickets       | n/a <!-- prefix each issue number with "Fix #", if any -->| License       | MIT| Doc PR        | n/aIn Symfony 6, I (we?) would want to promote usage of configuration written in PHP instead of YAML. For third-party bundles and core, we should do the same, replacing XML with PHP. Doing so would remove the need for the XML lib for core.The biggest advantage is auto-completion with any modern IDE without explicit support for Symfony, and probably one less thing to learn (how to configure things in YAML/XML).Be warned that it does NOT concern semantic configuration which is much harder.This PR does the work for the Twig bundle as an example. Once we agreed on the CS, the same should then be done for other core bundles both for service configuration and route configuration.Embeds#36775 until it is merged.Commits-------0aedd54 [Twig] Move configuration to PHP