Fix PortAudio streaming and interruption. #10
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Rewrite the PortAudio engine so it works closely to the audio model in mimic.
It fixes the streaming capabilities* of mimic when using PortAudio.
Ported from MycroftAI/mimic1#137
* In case you didn't know, mimic is able to play as soon as samples start being generated. A custom function can be written (example here) to get a direct pointer to the sample data. The linked example plays the wave file, but it could simply memcpy it to a buffer if desired... That function is called right after each frame is synthesized (e.g. for clustergen voices it's called here)