Use PortAudio-Sharp bindings for easier updates

Use COSFunctions for OS-specific stuff
Add dll directories on startup (could be done in the modules itself, but this way it avoids all trouble)

Output/PortAudioSharp.dll.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration><startup><supportedRuntime version="v2.0.50727" /></startup>
+	<dllmap dll="PortAudio.dll" target="libportaudio.so.2" />
+</configuration>