fix #42326: Allow adding an InstrumentChange to the first note #1743
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InstrumentList is a std::map<const int, Instrument>, where const int is a tick.
Since all keys in std::map are unique, I forbade adding several InstrumentChanges to one note/chord/rest.
Also I set default instrument's key to -1, so default instrument will not be replaced if user adds an InstrumentChange to the first note.