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
fix #21410: Notehead brackets collide with fret number
update regression tests
fix #17457: Articulations and ornaments included in application to bar lines if selecting measures
slight change in fermata algorithm
set default time strech for fermata to 1.0
fix tests
convert NSIS file to UTF8, add chinese translations
fixes

I have now verified that every single chord listed in chords.xml imports
and exports correctly.
fix #21430: Multi-voice Note Entry broken
remove loose dependency on Qt3Support