Name notes

Write note names in SPN below each note/chord.

One version of the plugin writes them as lyrics, with the lyrics verse number corresponding to the voice number of the note; the other version writes it as staff text, but autoplace makes that tricky, so prefer the lyrics version if you can.

Implemented by request from Mmike (Mario Splivalo) in IRC.

• notenames-as-lyrics_mu͒3.qml for Mu͒seScore 3 and 4, “as lyrics”
• notenames-as-stafftext_mu͒3.qml for Mu͒seScore 3 and 4, “as stafftext”