Moved include files to a proper sdl3game include directory

src/actor.c

@@ -4,13 +4,13 @@
 #include <string.h>
 #include <sdlerror.h>
 
-#include "game.h"
-#include "sprite.h"
-#include "actor.h"
-#include "heap.h"
-#include "registry.h"
-#include "staticstring.h"
-#include "iterator.h"
+#include <sdl3game/game.h>
+#include <sdl3game/sprite.h>
+#include <sdl3game/actor.h>
+#include <sdl3game/heap.h>
+#include <sdl3game/registry.h>
+#include <sdl3game/staticstring.h>
+#include <sdl3game/iterator.h>
 
 ErrorContext *actor_initialize(actor *obj, char *name)
 {