WUI: Overall update to WUI

- Added support for long requests to JSON client.
- Added API for add/remove member-group.
- Removed support for force-fed authz.
- Moved some calls to UtilsManager, removed PerunManager.
- Starting work on application state to have transparent
  state = page switching. It also allows us to have column
  definition in generic module, but page definition in specific
  module.