chore: export classes from MusicalScore/FileIO (#462)

src/Common/index.ts

@@ -1,3 +1,4 @@
 export * from "./DataObjects/Fraction";
 export * from "./DataObjects/Pitch";
 export * from "./Enums";
+export * from "./FileIO";

src/MusicalScore/ScoreIO/index.ts

@@ -4,3 +4,4 @@ export * from "./InstrumentReader";
 export * from "./MusicSheetReader";
 export * from "./MusicSymbolModuleFactory";
 export * from "./VoiceGenerator";
+export * from "./MusicSymbolModules";

src/MusicalScore/index.ts

@@ -7,3 +7,5 @@ export * from "./Label";
 export * from "./MusicSheet";
 export * from "./SubInstrument";
 export * from "./VoiceData";
+export * from "./MusicSource";
+export * from "./ScoreIO";