Disable count-in on player repeats

I suspect that most users of count-in want it only before the first time through, and not on each repetition of a loop, which seems surprising behavior to me. If the current count-each-time behavior also is desirable, then that could be an option...although we don't want too many more play icons; a global setting might be better. Or perhaps just suppress the additional counts if repeating the entire piece.

Speaking of the play panel, I might note that it took me surprisingly long to figure out how to set the loop range. The handbook simply says to set the end points, and the UI offers few clues about how to do this. Eventually I realized that normal measure selection would be the logical way, but it wasn't obvious (to me).