completed basic separation of visual renderer from simulation

stars.h

@@ -8,13 +8,16 @@
 
 class cStars {
 
+    friend class opengl_renderer;
+
 public:
 // types:
 
 // methods:
     void init();
-	void render();
-
+#ifdef EU07_USE_OLD_RENDERCODE
+    void render();
+#endif
 // constructors:
 
 // deconstructor:
@@ -29,5 +32,5 @@ private:
 // members:
     float m_longitude{ 19.0f }; // geograpic coordinates hardcoded roughly to Poland location, for the time being
     float m_latitude{ 52.0f };
-    TModel3d m_stars;
+    TModel3d *m_stars { nullptr };
 };