Refactor qmake SUBDIRS structure

The big swift.pro is refactored by the correct usage of SUBDIRS
template. The following additional changes are made:
- Removed '_' from all targets and folder names
- Aligned parent folder and target name

refs #461

src/plugins/simulator/xplaneconfig/simulatorxplaneconfig.cpp

@@ -0,0 +1,20 @@
+#include "simulatorxplaneconfig.h"
+#include "simulatorxplaneconfigwindow.h"
+
+namespace BlackSimPlugin
+{
+    namespace XPlane
+    {
+
+        CSimulatorXPlaneConfig::CSimulatorXPlaneConfig(QObject *parent) : QObject(parent)
+        {
+
+        }
+
+        BlackGui::CPluginConfigWindow *CSimulatorXPlaneConfig::createConfigWindow(QWidget *parent)
+        {
+            CSimulatorXPlaneConfigWindow* w = new CSimulatorXPlaneConfigWindow(parent);
+            return w;
+        }
+    }
+}