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
yeah, would take it step by step. ie. this PR already touches a lot of stuff.