Afegits destructors virtuals en les classes Sprite

source/explosions.h

@@ -1,10 +1,10 @@
 #pragma once
 
-#include <string> // for string
-#include <vector> // for vector
-#include "animated_sprite.h"
-#include <memory>
-#include "texture.h"
+#include <memory>  // for shared_ptr, unique_ptr
+#include <string>  // for string
+#include <vector>  // for vector
+class AnimatedSprite;
+class Texture;
 
 struct ExplosionTexture
 {