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
- [ ] Pass the variables from the url directly to the needed class
  - [ ] Backend: module, action, language
  - [ ] Frontend: url
- [x] Generate url's with the routing component

Note: since frontend url's are that custom, only the backend url's are build with the Symfony routing component (for now).

Related issue: https://github.com/forkcms/forkcms/issues/409
Thanks for the tip. I was allready looking at the chainRouter for further work, but the CMF bundle could indeed be a good step in the direction we want to take.

We stille have a lot of work though, before we can fully switch our routing to the Symfony stack. This is just a small step in the right direction.