New Features
- Add `Note::getDuration()` as an alias to `Note::getQuarterDuration()`
- Add `Duration` enum class
- Add `std::vector<std::string> Helper::midiNotes2pitches(int midiNote)`
- Add `void Score::setRepeat(int measureStart, int measureEnd)`
- `Chord` class:
- Add `.getIntervals()`
- Add `.getStackIntervals()`
Improved
- `Note` constructor now receives a `Duration` enum class as second parameter
- `Helper::midiNotes2pitch()` if the user try to do something impossible, now this method returns an error
Fixed
- Replace `Chord::getIntervalNames()` by `Chord::getIntervals()`
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