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

Renombrats alguns fitxers per consistencia

source/text.h

@@ -1,7 +1,11 @@
 #pragma once
 
-#include "sprite.h"
+#include <SDL2/SDL_render.h>  // for SDL_Renderer
+#include <SDL2/SDL_stdinc.h>  // for Uint8
+#include <string>             // for string
 #include "utils.h"
+class Sprite;  // lines 6-6
+class Texture;  // lines 7-7
 
 #define TXT_COLOR 1
 #define TXT_SHADOW 2