Export some functions and properties for use in plugins
Force full panning width for all soundfounts
fixed description in part.h
Improve TAB fretting algorithm.

An attempt to improve the current implementation to better deal with the case in forum post #29876 and possibly even with less specialized cases.

Changes:
- when a note changes of pitch, its fretting is discarded before any fretting
- each note not yet fretted is sorted for fretting as belonging to the string most convenient for it. This affects the order in which notes are evaluated during fretting.

Note: the algorithm can still be fooled by casual note entry and by changing note pitches by large intervals (octave), but it seems anyway better than before.
fix #29776: Solo is not activated on file load
fix MusicXml import of natural-flat and natural-sharp accidentals
fix import for quarter tone and three quarters tone accidentals when accidental tag is missing
fix microtonal accidentals export
fix microtonal accidentals import (e.g. from a MusicXml file exported by Sibelius 7.5)
Remove text styling from accessibility info
	modified:   libmscore/tempotext.cpp
	modified:   libmscore/text.cpp
fix #28316
	modified:   mscore/instrwidget.cpp
	modified:   mscore/instrwidget.ui
Add accessibility for instrwidget.ui
	modified:   mscore/instrwidget.ui
fix #30106: note input cursor too close too barline
add more text symbols & shortcuts
fix #29981: shortcuts for key sig, time sig, & symbols palettes
fix #30116: crash on crazy short tremolo
Merge pull request #1180 from MarcSabatella/30116

fix #30116: crash on crazy short tremolo
Merge pull request #1178 from MarcSabatella/30106

fix #30106: note input cursor too close too barline
fix #30071
cleanup and comments