Moved include files to a proper sdl3game include directory

src/sprite.c

@@ -5,13 +5,13 @@
 #include <jansson.h>
 #include <sdlerror.h>
 
-#include "game.h"
-#include "sprite.h"
-#include "json_helpers.h"
-#include "heap.h"
-#include "registry.h"
-#include "staticstring.h"
-#include "iterator.h"
+#include <sdl3game/game.h>
+#include <sdl3game/sprite.h>
+#include <sdl3game/json_helpers.h>
+#include <sdl3game/heap.h>
+#include <sdl3game/registry.h>
+#include <sdl3game/staticstring.h>
+#include <sdl3game/iterator.h>
 
 static ErrorContext *sprite_load_json_spritesheet(json_t *json, spritesheet **sheet)
 {