refs #212, flightplan GUI

* similar to http://www.vatsim.net/fp/
* own form, own widget class as a trial to further modularize GUI components
* removed all view models (now encapsulated)
* tweaked style sheet

samples/blackgui/flightplanwidget.h

@@ -0,0 +1,26 @@
+#ifndef BLACKGUI_FLIGHTPLANWIDGET_H
+#define BLACKGUI_FLIGHTPLANWIDGET_H
+
+#include <QFrame>
+
+namespace Ui
+{
+    class CFlightplanWidget;
+}
+
+namespace BlackGui
+{
+    class CFlightplanWidget : public QFrame
+    {
+        Q_OBJECT
+
+    public:
+        explicit CFlightplanWidget(QWidget *parent = nullptr);
+        ~CFlightplanWidget();
+
+    private:
+        Ui::CFlightplanWidget *ui;
+    };
+
+}
+#endif // guard