Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

environment/stars.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "Classes.h"
+
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// cStars -- simple starfield model, simulating appearance of starry sky
+
+class cStars {
+
+    friend opengl_renderer;
+    friend opengl33_renderer;
+
+public:
+// types:
+
+// methods:
+    void init();
+// constructors:
+    cStars() = default;
+// deconstructor:
+
+// members:
+
+private:
+// types:
+
+// methods:
+
+// 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 { nullptr };
+};