Summary:
This diff cleans up order remaining dialogs, the ones involved in exporting to file or url. Includes some legacy component cleanup boyscouting, but not too much.
This removes a lot of code where state of the wizard was stored globally, and makes it locally instead.
Other code that was removed involves interaction with the old UI, which allowed import / export to be running in the background as well. (which is no longer needed since we optimised the process)
Reviewed By: timur-valiev
Differential Revision: D30192000
fbshipit-source-id: 13be883c5bf217a3d58b610b78516359e9bd0ebc
d56375970d