Add SLAudio renderer for Steam Link

app/streaming/audio/renderers/slaud.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "renderer.h"
+#include <SLAudio.h>
+
+class SLAudioRenderer : public IAudioRenderer
+{
+public:
+    SLAudioRenderer();
+
+    virtual ~SLAudioRenderer();
+
+    virtual bool prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATION* opusConfig);
+
+    virtual bool submitAudio(short* audioBuffer, int audioSize);
+
+private:
+    CSLAudioContext* m_AudioContext;
+    CSLAudioStream* m_AudioStream;
+};