[Bug]: Audio Events not sent when an audio file finishes playing

[lucasstarsz]

What happened?

Because audio events are manually generated, they currently do not cover when an audio file finishes playing. That's a pretty big problem. (Related to: #23)

How to Reproduce the Error

1. Load any MemoryAudio/StreamedAudio instance
2. Log when that instance is closed (audio.getAudioEventListener().setAudioCloseOption(System.out::println)
  - You'll also need to set up some way to prevent the program from closing -- Thread.sleep(xxx) does this just fine.
3. Run the code -- nothing for the audio is printed out.

FastJ Version

snapshot (please specify below)

Specific FastJ Version

FastJ 1.6.0-SNAPSHOT-3 (any of them, really)

Java Version

Java 11

Relevant Exceptions/Log Output

No response

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