Audio Renderer improvements (#210)

* Partial voice implementation on audio renderer

* Implemented audren resampler (based on original impl)

* Fix BiquadFilter struct

* Pause audio playback on last stream buffer

* Split audren/audout files into separate folders, some minor cleanup

* Use AudioRendererParameter on GetWorkBufferSize aswell

* Bump audren version to REV4, name a few things, increase sample buffer size

* Remove useless new lines

Ryujinx.HLE/OsHle/Services/Aud/AudioRenderer/PlayState.cs

@@ -0,0 +1,9 @@
+namespace Ryujinx.HLE.OsHle.Services.Aud.AudioRenderer
+{
+    enum PlayState : byte
+    {
+        Playing = 0,
+        Stopped = 1,
+        Paused  = 2
+    }
+}