Improve the recording count-in/pre-roll situation

[helgoboss]

Discussed in #1010

^{Originally posted by helgoboss July 24, 2024}
I was initially thinking of just adding a "Record start timing" option that allows one to override the "Play start timing". But it might actually better to add a real count-in that can be used in stopped state (= silence mode). Also works like that in Live and has been requested by 2 users so far.