Replay playback speed to avoid scrambled output

[hholst80]

When running a ReplSend that runs over multiple lines it is sometimes favorable to have a short delay. It could be per character, or maybe per linefeed. The delays could also potentially be different.

This is a very hard problem to solve I know that (I have been working with tooling for this kind of problem myself before) but using a small delay might be enough for most use cases.