#56 Toy around with modal editting

I don't think it would be too difficult to make modal-style keybindings work in ait. Similarly to how C-x works, normal/command mode would happen when you hit some key (probably not esc at first) and then you'd have to hit i or I or something to go back to insert mode. While in insert mode, I think the Emacs bindings should still work.

I think this is out of scope.