test for different icon background color
fix crash for accidental palette
fix #21309: Grey out three options of Export layout if unticked in preferences
fix #21345: Part still visible if in view before deletion
make bracket span change undoable
fix #21313
fix #21277
use staff mag for lyrics line
fix total page number when page offset is !=0
remove VoiceSelector
fix #21269
Merge pull request #376 from lvinken/21269-musicxml-voltas

fix #21269
fix #21304
Merge pull request #379 from lvinken/21304-capx-2.0

fix #21304
MusicXML export of unrecognized chords

A chord description object is now generated for each (unique) unrecognized
chord, and MusicXML tags are generated during parsing for inclusion in the
chord description.  This allows unrecognized chords to be exported to
MusicXML using the same mechanisms as recognized chords.
MusicXML import of unrecognized chords

A new method is provided generate a chordname directly from a MusicXML
harmony object.  This chordname is then parsed and rendered just as for a
chordname typed directly into the score.
update also part name on SaveAs
add brackets.svg to mac resource file
add c++ wrapper for sndfile, replace ogg routines in fluid with sndfile
fix #20419