Fix all Harmony decoding

[DJBen]

LilyPondTest suite now has 59 failures.

[codecov-io]

Codecov Report

Merging #124 into latest will increase coverage by 5.47%.
The diff coverage is 88.83%.

@@            Coverage Diff             @@
##           latest     #124      +/-   ##
==========================================
+ Coverage    52.2%   57.67%   +5.47%     
==========================================
  Files         218      218              
  Lines        2632     2800     +168     
==========================================
+ Hits         1374     1615     +241     
+ Misses       1258     1185      -73

Impacted Files	Coverage Δ
Sources/MusicXML/Complex Types/Ornaments.swift	100% <ø> (ø)	⬆️
Sources/MusicXML/Complex Types/Root.swift	100% <ø> (+100%)	⬆️
Sources/MusicXML/Complex Types/Bass.swift	100% <ø> (+100%)	⬆️
Sources/MusicXML/Complex Types/Degree.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/BassAlter.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/BassStep.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/DegreeAlter.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/DegreeValue.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/Slide.swift	100% <100%> (+100%)	⬆️
Sources/MusicXML/Complex Types/RootStep.swift	100% <100%> (+100%)	⬆️
... and 16 more

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[jsbean]

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