Fix #25165 - crash when changing rest measure duration to or from irregular time.

When the actual duration of a measure is changed and either the starting or ending duration cannot be represented with a simple value (for instance 5/4) and the measure contains a single whole measure rest, a division by 0 results. See http://musescore.org/en/node/25165 for examples, discussion and analysis.

Fixed.

If the new measure value is different from the current time sig, rest(s) to represent the actual measure values are used instead of whole measure rests.
Tick where to place the newly added rests was wrong.
fix #25112 export slur on grace notes
fix #25112: import slur on grace notes
fix #25424: ottava playback solved
This fixes Gentoo bug #507712 (https://bugs.gentoo.org/507712)

Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>
Added new constructor for parts, removed unnecessary calls to
setParentScore.
fix #25447: Downward arpeggio does not render correctly in nightly build with emmentaler
Fixed test scores by removing redundant metaTags in parts section.
update to SMuFL 0.9
some vtest fixes

wrong pitch of two notes in noteheadposition-1.mscz,
2 accidentals and 3 segnos too much in emmentaler-1.mscz,
wrong position of two articulations in emmentaler-3.png,
wrong trills in emmentaler-8,
wrong position of two articulations in bravura-5-ref.png
and SMuFL 0.9 noteheads for slash semibreve in bravura-10

Also adding Windows batch file to generate the -ref.png files
fix #25449: Select all stems for only one voice
Merge pull request #846 from Jojo-Schmitz/vtest-fixes

some vtest fixes
fix #25454: unisons should share noteheads despite duration difference
fix #25246: line properties for voltas
fix #25384: grace note spacing
Support for voltas in GP5 files
Updated volta test to remove additional staff types; Updated iteration declaration to use auto keyword
fix #25456: Spurious key signatures appear when layout changes
Merge pull request #853 from jpirie/22898-guitar-pro-volta

Progress on #22898: Support for voltas in GP5 files