Fix BlackMisc header includes

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

refs #630

src/blackmisc/network/entityflags.h

@@ -14,7 +14,10 @@
 
 #include "blackmisc/blackmiscexport.h"
 #include "blackmisc/statusmessage.h"
-#include <QObject>
+
+#include <QFlags>
+#include <QMetaType>
+#include <QString>
 
 namespace BlackMisc
 {