expose part.volume to plugins
MuseScore 2 gave access to a part's volume (as in curScore.parts.volume), which gave me a way to create mp3 exports for each part with current stave set to 100% volume and all other staves set to eg. 50%. (See plugin skeleton: https://musescore.org/en/node/277716#comment-863605, which I'm currently trying to port to MuseScore 3).
Sadly, MuseScore 3 does not have the property "volume" on object "part" any more. Is there a different way to set part-specific volumes in plugins?
If not, my feature request would be to get (write) access to part.volume back in MuseScore 3.