Refactored all the rendering code into its own class

gamecore.h

@@ -9,9 +9,9 @@
 #ifndef _GAME_CORE_H_
 #define _GAME_CORE_H_
 
-#include <SDL/SDL.h>
 #include "mainevent.h"
 #include "gamedata.h"
+#include "sdlrenderer.h"
 
 class GameCore : public MainEvent
 {
@@ -28,16 +28,12 @@ class GameCore : public MainEvent
  private:
     bool init();
 
-    void iterate(); // updates the game state
     void render();
     void cleanup();
 
     bool is_running;
 
-    SDL_Surface* display;
-
-    // textures to draw
-    SDL_Surface* background;
+    SDLRenderer renderer;
 
     // data
     GameData data;