symfony routing

Integrating the Symfony routing component. This will make it easier to route some code to full stack Symfony (Bundles) when other code is still run on the legace code of Fork.

- [x] Replace the code in the routing.php file with the Symfony routing component
- [x] Load routes from a yaml file
- [x] Generate url's with the routing component

Things that should be done in a follow up request

- [ ] Pass the variables from the url directly to the needed class (controller)
  - [ ] Backend: module, action, language
  - [ ] Frontend: url
  - [ ] Api: version and url

Note: since frontend url's are that custom, only the backend url's are generated with the Symfony routing component (for now).

Related issue: https://github.com/forkcms/forkcms/issues/409

Not all tasks in this commit are done, but I think this already changes enough to not work futher on this pull request, and do further integration in other branches.