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

Renombrats alguns fitxers per consistencia

source/fade.cpp

@@ -1,6 +1,10 @@
 #include "fade.h"
-#include "param.h"
-#include <iostream>
+#include <SDL2/SDL_blendmode.h>  // for SDL_BLENDMODE_BLEND, SDL_BLENDMODE_NONE
+#include <SDL2/SDL_pixels.h>     // for SDL_PIXELFORMAT_RGBA8888
+#include <stdlib.h>              // for rand
+#include <algorithm>             // for min, max
+#include "param.h"               // for param
+#include "utils.h"               // for param_t, paramGame_t, paramFade_t
 
 // Constructor
 Fade::Fade(SDL_Renderer *renderer)