Revert "Revert "Soundfont Fixes""
Merge pull request #1547 from musescore/revert-1546-revert-1545-FixedSF

Revert "Revert "Soundfont Fixes""
simpler startcenter
fix bug with blank score in new wizard
enable double click on palette to add hairpins
use QHash for beam and tuplet list in XmlReader
fix #41546: Hairpins are inversed by double clicking on palette
add instrumentid to files to be able to know instrumentation
update mtest
replace QQuickView in effects with QQuickWidget
switch to Qt-5.4 on Windows
workaround for #40646