fix #20892
prevent zero slur crash
capx support stemdir, instrument name, invisible, hyphen and barlinemode
fix #20581
Fix #20907 - Regardless of check code in a plugin, starting a plugin with no score open crashes the program.

A diagnostic "prinf" statement was unconditionally trying to access the score name, even with no score. Corrected by adding a condition.
Merge pull request #329 from mgavioli/Fix_20907_plugin_no-score_crash

Fix #20907 - Crash when starting a plugin with no score open
Merge pull request #328 from lvinken/20581-capx-impl-3

20581 capx impl 3
Fix #20905: Can't nudge frames with keyboard

ScoreView::editKey() passed to Box::editDrag() bogus hRaster and vRaster values in the EditData struct.
Merge pull request #330 from mgavioli/Fix_20905_no_keybrd_nudge_for_frames

Fix #20905: Can't nudge frames with keyboard