Disable post 4.0 unnecessary routes.rb reloading.
Stop depending on the listen gem.
Merge branch 'refs/heads/no-linsten-gem-dep' into temp-mess
Best-effort detect auto-loadable constants used in routes.

This is done by associating any autoloaded constants that emanate (are autolaoded by AS) from evaling the routes.rb file as dependent on that routes.rb file.
Fix AS::Dep.remove_const with non-existent const.