I included proposal for AudioSynthesizer interface.
- SoftSynthesizer doesn't implement mixer interface anymore,
instead the method "openStream" has been added.
- New AudioSynthesizer interface.
- SoftSynthesizer.getVoiceStatus() is now thread-safe.
- SoftAudioFeeder renamed to SoftAudioPusher
and made more generic.
- Support for multi-receiver in SoftSynthesizer.
- More cleanup in SoftSynthesizer.
- Fixed loops in large soundbanks.
- AudioFileSoundbankReader added to META-INF/services.