Abbreviate note labels in Piano Roll

[myutin]

Enhancement Summary

I know there's more work already being done with the labels but here's a quick thought. If a note is too short to allow the full label (e.g. "G# / Ab 4"), let it display some shorter portion that does fit (e.g. "G# / Ab", or just "G#").
Right now, on medium-length notes (where shorter labels fit, but longer ones don't), it feels like the empty space is going to waste.

(maybe i should just stop writing in weird key signatures)

Implementation Details / Mockup

The abbreviations (or the truncation points) should be pre-defined, otherwise you'd get incorrect labels like "G# / A"

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