D&D for reordering

[IlgamGabdullin]

I have a need to change location of note 'c' from a.b.c to a.v.c with drag-and-drop. As I see it is not possible yet. Do you have any plans on adding the feature in the near future? I think I'd be able to bring PR if the described behaviour is ok

[Rudtrack]

I have no current plans to implement that, but if you want to develop it, I'll happily look at the PR!