Keep init code on router

FileRouter.swift

class FileRouter {

    // MARK: Properties

    weak var view: UIViewController?

    // MARK: Static methods

    static func setupModule() -> FileViewController {
        let viewController = UIStoryboard(name: FileViewController.storyboardName).instantiateViewController() as! FileViewController
        let presenter = FilePresenter()
        let router = FileRouter()
        let interactor = FileInteractor()

        viewController.presenter =  presenter

        presenter.view = viewController
        presenter.router = router
        presenter.interactor = interactor

        router.view = viewController

        interactor.output = presenter

        return viewController
    }
}