fix #31576: get right clef & key when inserting measures
fix #21110 : Glissando text raised more above wavy line
fix #30801: no key change for drum staff
fix #31481: plugin files configured to be loaded don't get removed when the file is removed
Merge pull request #1255 from Soerboe/21110-text-collides-glissando

fix #21110 : Glissando text raised more above wavy line
fix #31756: Spinner and Palette arrow badly painted
fix crash on first load of pluginManager
fix potential crash when unregistering a plugin
remove unused include
Merge pull request #1257 from MarcSabatella/30801-drum-key

fix #30801: no key change for drum staff
Merge pull request #1248 from MarcSabatella/31576-insert-measure-key-clef

fix #31576: get right clef & key when inserting measures