audio subsystem replacement: openal audio renderer and buffer class, removed deprecated files

audiorenderer.h

@@ -0,0 +1,47 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include "audio.h"
+
+namespace audio {
+
+class openal_renderer {
+
+public:
+// destructor
+    ~openal_renderer();
+// methods
+    // buffer methods
+    // returns handle to a buffer containing audio data from specified file
+    buffer_handle
+        fetch_buffer( std::string const &Filename );
+    // core methods
+    // initializes the service
+    bool
+        init();
+
+private:
+// methods
+    bool
+        init_caps();
+// members
+    ALCdevice * m_device { nullptr };
+    ALCcontext * m_context { nullptr };
+    bool m_ready { false }; // renderer is initialized and functional
+
+    buffer_manager m_buffers;
+};
+
+extern openal_renderer renderer;
+
+} // audio
+
+//---------------------------------------------------------------------------