#5224 Update EventChord to include a ChordSemantics event entry which captures input semantic information from chord mode and uses it to create chord names.

[Charles Winston]

Update EventChord to include a ChordSemantics event entry which captures input semantic information from chord mode and uses it to create chord names.

Without these semantics, naming chords based only on their notes results in ambiguous naming:
Example: Cm7 no root and Eb both have the exact same notes, and so there is no way to differentiate between them, unless we capture the data from chord mode: { cm:7.1 } as opposed to { eb }

A new patchset has been loaded at

https://codereview.appspot.com/568650043

The original patchset can be found at

https://codereview.appspot.com/337870043

[Carl Sorensen]

Regtests show some problems that need to be fixed.