[UX] add the ability to order menus

Describe your issue or idea

As a site-architect, I often want to order my menus on the admin/structure/menu page. I want them in a non-alpha order here so that I can put the menu I use most commonly on top, and have the Administration / Management menu on the very bottom, since I almost never want to change that one.

I would also like these weights to affect the order of menus as they appear in the Parent item select list on the node page, should the page be allowed into multiple menus.