refactor common features into RoutingBundle

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes (small ones)
| Deprecations? | yes
| Tests pass?   | not yet
| Fixed tickets | https://github.com/symfony-cmf/RoutingBundle/pull/210
| License       | MIT
| Doc PR        | TODO

adjust to https://github.com/symfony-cmf/RoutingBundle/pull/210