Move contents of src into project sub directory

src/openrct2/audio/NullAudioSource.cpp

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+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+ * For more information, visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * A full copy of the GNU General Public License can be found in licence.txt
+ *****************************************************************************/
+#pragma endregion
+
+#include "AudioSource.h"
+
+/**
+ * An audio source representing silence.
+ */
+class NullAudioSource : public IAudioSource
+{
+public:
+    uint64 GetLength() override
+    {
+        return 0;
+    }
+
+    AudioFormat GetFormat() override
+    {
+        return { 0 };
+    }
+
+    size_t Read(void * dst, uint64 offset, size_t len) override
+    {
+        return 0;
+    }
+};
+
+IAudioSource * AudioSource::CreateNull()
+{
+    return new NullAudioSource();
+}