refactoring spanner, part I
refactoring grace note implementation
refactoring grace notes
updates
fix #12008: Multi-stave notes will not fully paste on value not matching another stave's value. Also fix #7211
fix #11915: 1.X score with E#'s displaying as F#'s
fix regressions
merge with master
commented out not yet working regression tests
fix build
reaktivate measure regression test
fix regression for volta
fix regression for grace notes
proper merging for #12008 and #12138
use multimap for spanner list
slur direction is down by default for grace notes
fix slur for grace note
Fix for issue #8027

Missing note MIDI #94 has now been fixed in the soundfont. The soundfont
has also been converted to SF3 format. Embedded references to the
filename have also been edited.
Merge pull request #387 from ChurchOrganist/Fix-for-#8027

Fix for issue #8027
fix cut&paste of slured grace notes