Playback should have "Start From Beginning" and "Loop Selected Range" options

Task description
Add two toggles to the playback settings that mimics behavior of MuseScore 3. They both helped speed up the process of messing with a section until you've written it properly. Also I like pressing space bar a lot to hear a section over and over until I get something I like.

1. "Start From Beginning" - when you press play, the playback cursor jumps back to the loop start point. This allows you to work on a section quickly by just being able hammer the space bar, similar to how FL Studio works.
2. "Loop Selected Range" - if you're selecting a region when you press play, it will automatically set the loop start and end points to that region. A better name might be "Automatically Update Loop Points" or something like that.

I might take a crack at programming it. I haven't worked on a large-scale community project before, so it might be interesting to take on.