[WIP] Refactoring

A lot of work, but I'm glad it was started

* [x] apply PSR
* [ ] add interface
* [x] refactor view
* [ ] get rid of bundles
* [ ] rename `symfony` to `Symfony`
* [ ] fix typos
... (to be continued)

 Goals:

* [ ] Less code
* [ ] Error handling
* [ ] Stability
* [ ] Make it work on `symfony standard-edition`