Add External Display

Can you allow us to use iSH with an external display and allowing us to switch the focus between each screen ?

Exemple :
Pressing ctrl+[ or ctrl+] to move focus on next screen.
Add an on-screen button to switch screen next to the arrow button.

That allow us to use a second screen and became really more productive because you can use iPad as a real development machine like I can use my computer.

The issue names no files or tests. Start by tracing iSH's iOS display handling and existing arrow-button focus controls; done means supporting an external display and switching focus with the proposed keyboard shortcuts or an on-screen button.

Written by the indexing model from the issue text.