The start of the new account editor.

Right now this just modifies proxy info, and uses some "secret" buttons so that
we don't have to break the existing account editor until this one is finished.

Testing Done:
Created a new account using the tau button.
Modified an account using the pi button and verified it's settings matched the old editor.
Modified an account using the old editor and verified that the new editor showed the changes.

Reviewed at https://reviews.imfreedom.org/r/1569/