Initial reverb implementation

Oh, I think I understand now. You're asking if we should support

AudioDevice.setReverbOptions({reverbTime: 10, damping: 0.1});

It's definitely possible. I do not believe there are plans to leave this exposed to users or script developers - the JavaScript interface is for HiFi audio developers to easily test different values while reverb is being integrated with the audio ray caster. Once reverb is working correctly and automatically, I'm not sure there's a reason to leave it configurable by script. 

That being said, if you would prefer supporting hashes, I can make that change.