Fix BlackMisc header includes

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

refs #630

src/blackmisc/aviation/transponder.cpp

@@ -11,6 +11,10 @@
 #include "blackmisc/propertyindex.h"
 #include "blackmisc/variant.h"
 
+#include <QRegExp>
+#include <Qt>
+#include <QtDebug>
+
 namespace BlackMisc
 {
     namespace Aviation