Fix #19472

Implements [Left] / [Right] not only from notes/chord-rests but from any element whose parent is a note, a chord-rest or a segment
For elements attached to segments, move to the chord/rest in element track, if it exists
fix copy/paste of beam; more copy/paste regression tests
ignore unhandled elements in paste
Stops continuous reformatting of float data entered in inspector widgets
fix 'about' window
TAB formatting re-aligned with changes on semantics for chord and stem function computing stem data.
fix for pitch split + regression test
fix some xml reader regressions
more regressions fixes for xml reader
small debug additions
remove 2.0 tags from 1.2 importer
merge read114 branch
add regression test: import hairpin from 1.2
show spanner for measures in debugger
fix for part creation; fix hairpin import from 1.2
Update README.md
add some checks for corrupted input files
Stops continuous reformatting of float data entered in EditTools widgets.
Merge pull request #180 from mgavioli/Fix_#19611_#19709_tab_stem_too_long

Fix #19611 and #19709 - TAB stems too long