remove unused beam style properties
fix #20624
fix #22059: MusicXML import/export of voltas and slurs
add missing file...
fix slurs and voltas import from capella
fix volta import for OVE
change qt5 hosting for travis
fix #21952: Guitar Pro Mixed tuplets incorrectly imported
add guitar pro test
fix #17741
fix regression: beam editing
fix #17967
clarify style dialog labels: remove Y-position -> vertical position, width -> thickness, use : at end of label
fix typo
fix #22125
add message when inspector is empty