Refactor Audio Backend to support single listener only

Source/Engine/Audio/Config.h

@@ -5,16 +5,7 @@
 #include "Engine/Core/Config.h"
 
 // The maximum amount of listeners used at once
-#define AUDIO_MAX_LISTENERS 8
+#define AUDIO_MAX_LISTENERS 1
 
 // The maximum amount of audio emitter buffers
 #define AUDIO_MAX_SOURCE_BUFFERS (ASSET_FILE_DATA_CHUNKS)
-
-// The type of the audio source IDs used to identify it (per listener)
-#define AUDIO_SOURCE_ID_TYPE uint32
-
-// The type of the audio buffer IDs used to identify it
-#define AUDIO_BUFFER_ID_TYPE uint32
-
-// The buffer ID that is invalid (unused)
-#define AUDIO_BUFFER_ID_INVALID 0