Pasaeta de "include-what-you-use" per arreglar els includes

Renombrats alguns fitxers per consistencia

source/item.cpp

@@ -1,5 +1,8 @@
 #include "item.h"
-#include "param.h"
+#include <stdlib.h>          // for rand
+#include "animated_sprite.h"  // for AnimatedSprite
+#include "param.h"           // for param
+class Texture;
 
 // Constructor
 Item::Item(int kind, float x, float y, SDL_Rect *playArea, Texture *texture, std::vector<std::string> *animation)