Move to controller as a service

Mostly using autowiring to inject deps.
The only tricky part was for import because all producer use the same class and have a different alias. So we must write them down in the service definition, autowiring doesn't work in that case.

Usually:
- if a controller has a constructor, it means injected services are at least re-used once in actions
- otherwise, service are injected per action

src/Wallabag/CoreBundle/Helper/EntriesExport.php

@@ -9,7 +9,7 @@ use PHPePub\Core\EPub;
 use PHPePub\Core\Structure\OPF\DublinCore;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 use Wallabag\CoreBundle\Entity\Entry;
 use Wallabag\UserBundle\Entity\User;