Improve handling of remote input and output when enabled.

[RobinJadoul]

This makes the handling of the prompt and the display of external inputs and outputs less messy, ensuring it looks more like something that was run in the actual console (with a "Remote" prefix), while not having the local input prompt all throughout the text.

I'm not sure if this warrants extra tests, or how to write those, so potential advise there would be appreciated.