Dev gz

[gregzanch]

fix for #58

two things had to be changed:

1. AudioBuffer did not have a copyToChannel method, so the returned buffer in AudioEngine.createBufferSource had to be filled manually like so:

const sourceBuffer = source.buffer.getChannelData(0);
sourceBuffer.set(buffer, 0);

2. Apparently OfflineAudioContext.startRendering() does not return the rendered AudioBuffer, instead it can be pulled out of the event callback OfflineAudioContext.oncomplete like so:

context.oncomplete = function(event: OfflineAudioCompletionEvent) {
  if(!event.renderedBuffer){
    reject("failed to get renderedBuffer after context completed rendering");
  } else {
    resolve(event.renderedBuffer);
  }
};
context.startRendering();

see AudioEngine.renderContextAsync for implementation.

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