Alsa

[k2fc]

add basic ALSA support.

AlsaIn and AlsaOut classes work
using (var output = new AlsaOut()) creates an IWavePlayer on the default device. You can add a PCM name to use a specific output, like using (var output = new AlsaOut("hw:0"))

AlsaIn also works. and creates an IWaveIn... using (var output = new AlsaIn("hw:0")).

The AlsaCard, AlsaDevice, and AlsaDriver classes aren't complete yet, but aren't necessary to get audio in and out.

[SMSapereAude]

@markheath any input? I'd like to commit our works for PulseAudio, but it seems the project is not active anymore...