Initial go using Rustler

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Originally meant to do this using port drivers, but found the interface using Rust binding for JACK and Rustler to be much more pleasant to work with -- specifically, compiler checks for threads, which is required when interfacing with JACK, means my shoddy programming won't get too much in the way. That said, I don't know the full implications of using Rust JACK and need to understand how they're handling JACK's callback method. I get the feeling we're building threads upon threads and perhaps this is fine for our latency SLA at the moment, but it won't be in the distant future. This project will essentially be one layer above ExALSA, which makes sense seeing how JACK is a layer above ALSA. But that means we should probably offer ExALSA as an OTP server, which we already have.