Rather than have an extraneous form on the login page,
move the token input to a separate page. The actual
logic for logging in is identical, the only difference
is that the token is added to the form data on a second
page request.
Bug: 53195
Change-Id: I39859cc59f1811de42b72f6167d332ea48812f97
Made new class ProxySpecialPage, which acts as a
proxy object to another SpecialPage object that is
determined based on context information other than
the title.
Then Special:OATH has been split into two separate
special page classes (both FormSpecialPages using
HTMLForm) that are routed to by a ProxySpecialPage
object.
In addition, the form for enabling two-factor auth
has been refactored into vform style, with some
better instructions on how to enable two-factor
authentication.
Change-Id: Ib9117cbc9d7f044de9607db81a157e1b472b5ec0