Next inversion: replaces all chord(s) in (keyboard) selection with their next inversion

EDIT 19/8/2024 : Now MU4 compatible thanks to graffesmusic (https://musescore.org/en/user/3835870)
See: https://musescore.org/en/node/270487#comment-1253213

EDIT: fixed a bug. Situations like these (with right hand chords selected) run alright now.

Please report issues in the forum. To test it yourself select measures 9-12 in test.mscz (attached) & run the plugin. You should get the result shown in measures 5-8.