Reopeninig: Use the correct Symfony Controller class based on Symfony version

[snebes]

Ref #671

I hate to have to do this, but at this point in time, Symfony is throwing the deprecation messages without a way ignore them. Even their tests are checking for them. This required a tweak to the travis config.

Also updated 2 interfaces with incorrect docBlocks.

[XWB]

Nice, thanks @snebes :)

[onEXHovia]

@XWB this is a BC break for me on version symfony 4.3

An exception has been thrown during the rendering of a template ("Service "fos_comment.manager.thread" not found: even though it exists in the app's container, the container inside "App\Controller\ThreadController" is a smaller service locator that only knows about the "doctrine", "form.factory", "http_kernel", "parameter_bag", "request_stack", "router", "security.authorization_checker", "security.csrf.token_manager", "security.token_storage", "serializer", "session", "templating" and "twig" services. Try using dependency injection instead.").

AbstractController uses a limited dependencies in container. More information:
symfony/symfony-docs#9926 (comment)
symfony/symfony-docs#9926 (comment)