Fix unit test header includes

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

refs #598

tests/blackmisc/main.cpp

@@ -16,8 +16,9 @@
 
 #include "testblackmiscmain.h"
 #include "blackmisc/registermetadata.h"
+
 #include <QCoreApplication>
-#include <QDebug>
+#include <QtGlobal>
 
 using namespace BlackMiscTest;