refs #643, moved aircraft model icon loading to model class

* removed iconForModel from interface and aircraft config parser
* CPixmap support for loading pixmap from file
* Access to model of model set loader by model string
* icon path as member of CAircraftModel

src/blackmisc/simulation/simulatedaircraft.h

@@ -313,6 +313,9 @@ namespace BlackMisc
             //! Get model
             const BlackMisc::Simulation::CAircraftModel &getModel() const { return m_model; }
 
+            //! \copydoc BlackMisc::Simulation::CAircraftModel::getIconPath
+            const QString &getIconPath() const { return m_model.getIconPath(); }
+
             //! Get model string
             QString getModelString() const { return m_model.getModelString(); }