Feature request: attach notation elements to barlines

[Jamie Bullock]

Hi,

Something I often want to be able to do is to attach a notational
element to a barline. For example:

|\fermata       - place a fermata over a barline
|\!             - end a (de)crescendo at a barline
|\sustainUp     - end pedalling at a barline
|\stopTextSpan  - end a text spanner over a barline

What would the estmated implementation difficulty and sponsorhip cost be
for this?

Many thanks,

Jamie 

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