Support for the fade articulation in fonts, and import in GP4 and GP5 formats
Merge pull request #988 from jpirie/23058-fade

Fade-in articulation in GP4 and GP5 formats
New mscore.ttf font file generated using an older version of FontForge
Merge pull request #1032 from jpirie/new-ttf

New mscore.ttf font file generated using an older version of FontForge
fixes for slur editing
Added cloneRange function that creates a modifiable copy of range.
Added spannerMapCopy function that creates a modifiable copy of the score spanner map.
Fixed ottava copy constructor to include style data
Changed tremolo clone
Changed two-note tremolo copy-paste.
In progress. fix for paste of 2 note tremolo that will not fit into bar.