fix #20996 #20994
update for bug #16047: fix crash on undo
fix regression; cleanups
fix some compilation warnings
cheap fix for crash in RepeatList::utick2tick on Windows
fixes for stem layout
fix beam regression
fix typo and caps in general style dialog
fix #21189: Page Settings -> first Page number is not retained from a 1.x score
fix stems for drum staves
fix grace note stem layout
fix #9009
remove drumset checkbox from Mixer
fix #21066, fix #18693, manually merge pull request #165
add predefined sizes to foto mode
fix inspector for lasso (fotomode)
Add support for parentheses before/after chords.

This allows a chord or sequence of chords to be indicated as optional
or alternative, and avoids the need to add the parentheses as text
or extra chords.
Remove obsolete assignment to _userName
Some refactoring, more comments
Tree view for MIDI import operations