Reordering Sound.js export and its _initialize() call.
          #317
        
          
      
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The current version doesn't work in webpack, since it tries to create a reference to
Sound, but the initialization forSoundincludes creating instances of other classes (such asAbstractAudioWrapper) that require a reference toSoundwhich has yet to be created. By re-ordering the export so that it is exported before it is initialized, a reference forSoundexists for those classes requiring it inSound's_initialize()invocation.