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/Controller/StaticController.php

@@ -12,7 +12,7 @@ class StaticController extends Controller
      */
     public function howtoAction()
     {
-        $addonsUrl = $this->container->getParameter('addons_url');
+        $addonsUrl = $this->getParameter('addons_url');
 
         return $this->render(
             '@WallabagCore/Static/howto.html.twig',