Vi Mode Bar => Status-Bar

[Sven Brauch]

I've talked to Andreas about this, the solution he suggested was
providing the vi mode stuff as a seperate widget to the application
embedding the editor, and letting it handle it -- with a way for the
application to reject handling it, in which case it would work as it
works now.
This sounds like a good idea to me, it would allow us to not have a
status bar while not in vi mode, and you could merge the bars on your
side. Would that work?

Cheers,
Sven