hide style->chord symbols behind -e flag
fix #23708: select text in dialogs when first displayed to make data entry faster
fix #23366

hopefully the last for this issue...
partial fix #23622

only for the missing units mentioned in the issue
Merge pull request #573 from Jojo-Schmitz/orig.texts

fix #23366 plus partial fix for #23622
fix 23727: Stem direction wrong for beamed chords
fix beam regression in last commit
fix beam test
ReducedFraction class with int overflow detection (MIDI import)
Fix #23481: crash due to int overflow on import of a big MIDI file
Small refactoring for shorter code