fix #40091: double flat/sharp in chord symbols
add double flat/sharp to MuseJazz
use same version of MuseJazz on all platforms
update vtests
Remove Mac defines for accessibility.
fix #40641: incorrect import/export of relative-x
Merge pull request #1508 from MarcSabatella/40641-relative-x

fix #40641: incorrect import/export of relative-x
Merge pull request #1499 from MarcSabatella/40091-double-accidental-chords

40091 double accidental chords
Merge pull request #1505 from andreituicu/remove_mac_defines

Remove Mac defines for accessibility.
don't implode voices of different rhythms

as this it can lead to data loss.
On imploding staves it could lead to some incorrectness, but as the old
staves are still there, this can get spotted and fixed.