- Props want objects, but when json encoding empty arrays they become arrays.
- Prevent rendering of the form when its empty anyway

- Rename the global site selector
- Remove extra li elements, fix dropdown positioning.
- Move the structure site selector up a level. It's generic enough. The global set publish form will use it.

- Remove ID from globals. Having the handle is nicer in most cases. The ID was there so if you rename the handle things wouldnt break. Things will break anyway if you're renaming the handle.
- Global sets id method is now just a getter (like collections). It aliases the handle.
- Adjust global routes and controllers. The variables controller handles the publish form. The globals controller now deals with global sets themselves.
- Dedicated configure/edit form instead of a stack. That doesn't happen anywhere else anymore.
- Moved controllers into namespace
- Multisite fixes. Some things were applied to the entry publish form but not carried over to the globals
- Scrap the localization logic. It will work like navs. When you configure the global, it will create the appropriate localized files. Rather than being created on the fly when you use the switcher. (The creation step hasn't been done yet.)

ps. sorry for megacommit

…r that site. Doesn't need to be defined on the set level.