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.Audio/AudioFormat.cs

@@ -1,13 +0,0 @@
-namespace Ryujinx.Audio
-{
-    public enum AudioFormat
-    {
-        Invalid  = 0,
-        PcmInt8  = 1,
-        PcmInt16 = 2,
-        PcmImt24 = 3,
-        PcmImt32 = 4,
-        PcmFloat = 5,
-        Adpcm    = 6
-    }
-}