Move IVoice enum registration into static method

refs #183

src/blackcore/blackcorefreefunctions.cpp

@@ -0,0 +1,17 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  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/. */
+
+#include "blackcorefreefunctions.h"
+#include "voice.h"
+
+
+namespace BlackCore
+{
+    void registerMetadata()
+    {
+        IVoice::registerMetadata();
+    }
+
+} // namespace