Adds a builder for configuring outputstreams

[yara-blue]

Its basically the same as the microphone builder. It will replace the OutputStream. In the future we'll add more abstractions on top. Until its done it lives under an experimental flag.

Names are subject to change too, Speakers is probably not ideal but it conveys the meaning better then OutputStream. I'm thinking of having a Source -> Stream -> Sink terminolgy where a Sink could be the audio card, the network or a file (the wavwriter).