excaliburjs / Excalibur / 20436979281

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feat: Sound scheduled start (#3545)


- Added new parameter to `ex.Sounds` to schedule start time, this allows you to synchronize playback of multiple audio tracks
  ```typescript
  const start500MsFromNow = AudioContextFactory.currentTime() + 500;

  Resources.MusicSurface.play({ volume: .5, scheduledStartTime: start500MsFromNow });
  // Start layered tracks at 0 volume so they are synchronized
  Resources.MusicIndDrums.play({ volume: 0, scheduledStartTime: start500MsFromNow });
  Resources.MusicIndTopper.play({ volume: 0, scheduledStartTime: start500MsFromNow });
  Resources.MusicGroovyDrums.play({ volume: 0, scheduledStartTime: start500MsFromNow });
  Resources.MusicGroovyTopper.play({ volume: 0, scheduledStartTime: start500MsFromNow });
  ```

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