TODO for brach namespace_handling_refactor:

- refactor code in 
  * Catalyst::Dispatcher::get_containers           # No Idea
  * Catalyst::Dispatcher::get_containers           # No Idea

  * Catalyst::Controller::_parse_ActionClass_attr  # DONE
  * Catalyst::Dispatcher::_load_dispatch_types     # DONE
  * Catalyst::setup_plugins                        # DONE
  to use the same namespacing method