Improve handling of _text and _layout
Show Harmony text in Object Debugger
Ignore Return key when editing Harmony

Also added placeholder for possible reinstatement of setUnstyled()
initial (partial) implementation #20581
fix #11261: improved logic for inserting measures
Revert to unstyled text for Harmony
Fix unstyled text to obey alignment
Revert 9118b9c as not needed for Harmony...

It also caused issues with standard simple text, such as the title box.
Give an edit frame a little padding, like in 1.3
Adds more actions and shortcuts to manage:

*) shortcuts for note pad values split for TAB and non-TAB note entry
*) TAB: fret note entry, string and chord navigation with easier shortcuts
fix #20768: remove msc from album, add several scores
Adds more actions and shortcuts to manage:

*) shortcuts for note pad values split for TAB and non-TAB note entry
*) TAB: new shortcuts for increase/decrease note pad value
*) TAB: fret note entry, string and chord navigation with easier shortcuts
*) HARMONY/FIGBASS: shortcuts for 'measured' advances
*) HARMONY/FIGBASS: shortcuts for jump to prev/next measure
*) HARMONY: shortcuts for jump to prev/next beat
Resolves conflicts by commenting out MuseScore::enableInputToolbar()
Swap actions "pitch-up/down" and pitch-up/down-diatonic" for TAB's
Add [Shift][#] and NumPad [#] shortcuts for pad note value selection
Keep "pad-note-...-TAB" shortcuts always disabled and "pad-note.---" actions enabled in all input modes.

Key sequences for "pad-note-...-TAB" shortcuts are swapped into "pad-note-..." actions when entering TAB entry mode and original key sequences restored when leaving it.
midi reorganization
do not use system font weight setting for score fonts
Update to Instruments.xml

Untuned percussion is now XML 3 compatible
fix crash when deleting built-in soundfont from synth
fix #20759