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/ParamConverter/UsernameFeedTokenConverter.php

@@ -77,6 +77,10 @@ class UsernameFeedTokenConverter implements ParamConverterInterface
         // Get actual entity manager for class
         $em = $this->registry->getManagerForClass($configuration->getClass());
 
+        if (null === $em) {
+            return false;
+        }
+
         /** @var UserRepository $userRepository */
         $userRepository = $em->getRepository($configuration->getClass());