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

Renombrats alguns fitxers per consistencia

source/intro.h

@@ -1,16 +1,16 @@
 #pragma once
 
-#include <SDL2/SDL.h>
-#include "asset.h"
-#include "input.h"
-#include "jail_audio.h"
-#include "screen.h"
-#include "smartsprite.h"
-#include "utils.h"
-#include "writer.h"
-#include "lang.h"
-#include <vector>
-#include "section.h"
+#include <SDL2/SDL_events.h>  // for SDL_Event
+#include <SDL2/SDL_stdinc.h>  // for Uint32, Uint8
+#include <vector>             // for vector
+class Asset;
+class Input;
+class Screen;
+class SmartSprite;
+class Text;
+class Texture;
+class Writer;
+struct JA_Music_t;
 
 /*
 	Esta clase gestiona un estado del programa. Se encarga de mostrar la secuencia