Make Grid take an edit id

[Valentin Petzel]

Hello,

I’ve started an attempt for allow multiple different Grids by giving ids. See 
the MR: https://gitlab.com/lilypond/lilypond/-/merge_requests/1099

I’d love to hear your thoughts and critique on that. Also I suppose it would 
be reasonable to add more controllable way of doing GridPoints than just 
having them appear periodically. This would probably either call for some sort 
of grid point event or at least some context property to force a gridpoint 
even if the timestep is not a multiple of the grid interval. Or something 
similar.

Cheers,
Valentin

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