set start/end and range in [play.file~]

[porres]

see also #2118

[porres]

about set:

When playing a file in a loop and I click on this message, the new sound file is played next time it restarts the loop.

But when having the object not playing anything with some file loaded, when I set the new file it still plays the old one when I start playing (it only goes to the next one that I had set later when it loops). So this is a bug.