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

Renombrats alguns fitxers per consistencia

source/balloon.cpp

@@ -1,5 +1,11 @@
 #include "balloon.h"
-#include "param.h"
+#include <bits/std_abs.h>    // for abs
+#include <math.h>            // for abs
+#include "animated_sprite.h"  // for AnimatedSprite
+#include "moving_sprite.h"    // for MovingSprite
+#include "param.h"           // for param
+#include "sprite.h"          // for Sprite
+#include "texture.h"         // for Texture
 
 // Constructor
 Balloon::Balloon(float x, float y, Uint8 kind, float velx, float speed, Uint16 creationtimer, Texture *texture, std::vector<std::string> *animation)