Use SSH to connect to IO

With d9d01e6 , we began using the wish package to allow secure SSH connections to the IO TUI. Pros This just feels unbelievably cool. SSH connections are secured with user's SSH keys and configurable in IO. This allows users to connect and disconnect from running IOs. There is no need to stop IO just to end an interactive session. Cons It's not an HTTP console, so this feels a bit out-of-place alongside the web consoles for Kubernetes, Nomad, and other system tools.