refs #391, allow to send aircraft parts from GUI

* GUI component for aircraft parts
* remote aircraft selector component
* Adjusted GUI for internals component
* Enable / disable debug messages from GUI
* Allow to init engines directly
* Removed unused async sort in sequence

In same step fixed found issues in interpolator
* allow to set max rendered aircraft

src/swiftgui_standard/swiftguistd.h

@@ -58,7 +58,8 @@ public:
     enum MainPageIndex
     {
         MainPageInfoArea = 0,
-        MainPageLogin  = 1
+        MainPageLogin  = 1,
+        MainPageInternals = 2
     };
 
     //! Constructor