Added a (registry object name -> registry object pointer) map to the save method so that registry reference by name can have their actor, sprite, spritesheet, and character references reset

src/heap.c

@@ -171,7 +171,7 @@ akerr_ErrorContext *akgl_heap_release_spritesheet(akgl_SpriteSheet *ptr)
     }
     if ( ptr->refcount == 0 ) {
 	// TODO : If we go threaded, make sure this is only happening on the main thread
-	SDL_ClearProperty(AKGL_AKGL_REGISTRY_SPRITESHEET, (char *)&ptr->name);
+	SDL_ClearProperty(AKGL_REGISTRY_SPRITESHEET, (char *)&ptr->name);
 	if ( ptr-> texture != NULL )
 	    SDL_DestroyTexture(ptr->texture);
 	ptr->texture = NULL;