Fix BlackCore header includes

* Include only what is used
* Use forward declaration when possible
* Sorted includes

refs #598

src/blackcore/voicechannelvatlib.cpp

@@ -9,10 +9,13 @@
 
 //! \cond PRIVATE
 
-#include "voicechannelvatlib.h"
+#include "blackcore/voicechannelvatlib.h"
 #include "blackmisc/logmessage.h"
+#include "blackmisc/statusmessage.h"
 
-#include <mutex>
+#include <QList>
+#include <QStringList>
+#include <QtGlobal>
 
 using namespace BlackMisc;
 using namespace BlackMisc::Audio;