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/pixmap.h

@@ -14,6 +14,7 @@
 
 #include "blackmiscexport.h"
 #include "valueobject.h"
+#include "statusmessage.h"
 #include <QPixmap>
 #include <QReadWriteLock>
 
@@ -51,6 +52,9 @@ namespace BlackMisc
         //! \copydoc BlackMisc::Mixin::String::toQString
         QString convertToQString(bool i18n = false) const;
 
+        //! Load from file
+        static CPixmap loadFromFile(const QString &filePath, CStatusMessage &msg);
+
     private:
         //! Init the byte array with data
         void fillByteArray();