Expand multi-track preset functionality to folders, groups, etc

This is pretty important imo, being able to load entire folder-group hierarchies would save me hours of time that I spend on each track currently. It is very hazardous to a healthy workflow to have to set up routing like this so often.

It’s also a feature that’s been desired for a while now: https://www.steinberg.net/forums/viewtopic.php?t=124532