Added some structuring.

The game runs but only a black window is shown.

src/gameplaysceneclassic.cpp

@@ -0,0 +1,26 @@
+#include "gameplaysceneclassic.hpp"
+
+namespace cloonel {
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	GameplaySceneClassic::GameplaySceneClassic (SDLMain* parSdlMain) :
+		GameplayScene(parSdlMain)
+	{
+	}
+
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	GameplaySceneClassic::~GameplaySceneClassic() noexcept {
+		Destroy();
+	}
+
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	void GameplaySceneClassic::Prepare() {
+	}
+
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	void GameplaySceneClassic::Destroy() noexcept {
+	}
+} //namespace cloonel