Do not clear screen for question/list prompts

This one is from Inquirer.js too:


Basically Inquirer.js can ask questions without clearing the screen (and printing the question to x=0 y=0) ishell currently clears the screen when called like `ishell.New().MultiChoice(...)`

(P.S. also in the `long-list.js` example above, if the list is longer than N items, it allows limiting the scroll area to N items, while still allowing user to scroll. but that's a separate topic.)