Drupal 8.x

Hi.
I need to import entities in Drupal 8 via UI and I was wondering if there is somebody who has already done some work?

Since Migrate takes care of ID mapping it's obviously the best choice for this type of functionality, so making a cusotm import wouldn't be a good idea, but it has no UI and frankly I have no idea how to approach it.

So if there is already some work done on the UI for migrate module let me know(for example a GitHub repo or something).

I am trying to install a contrib module (devel) on my Drupal 8 sandbox. When I go to the UI (/admin/modules/install) and enter the module url and click save, it thinks for a bit and brings me back to the same page, without the module installed. I have been able to create a custom module and install it, but this method isn't working for me.

Is there an equivalent to menu_get_object() in Drupal 8? I'm trying to find a way to determine whether a given URL path represents an entity, and load that entity object if it does.

How do I load an entity object given a system path (e.g. "node/123" or "some-entity-type/456").

Is there going to be any support for new drafts of published content in Drupal 8? Or are we going to need to wait to upgrade until Workbench Moderation has a Drupal 8 version?

hi ,
in this page :
https://api.drupal.org/api/drupal/core!modules!user!user.services.yml/8

there are some service tags like this :
tags:
- { name: access_check, applies_to: _access_user_register }

I would like to know what does mean "applies_to: _access_user_register" ? What is the parameter "_access_user_register" ?

Thanks