TODO

Partial 'readline' support with onkeypress/onkeydown?
- <C-a>, <C-e>, <C-w>(?), up, down
- Should we attempt <C-z> for Suspend mode?
Prompt disable/keystroke pass-through to shell
- e.g. can you maybe make a rogue like?
Display partial redraw, or give more fine-grain display access?
- split all display items into lines?