Make status bar draggable

> **bca9023** created the issue

In most osx apps when the bottom status bar looks the way it does in Cyberduck 3 you can grab it and drag the window around (e.g. iTunes). i think this would be useful for Cyberduck as well (and AFAIK there's no other reason to touch the status bar that could conflict with this. I've never done it but I don't think it's too hard to set it up. 

Thanks!