[ecs] Pass the registry in to the component destroy function

This makes it possible for hierarchies to clean themselves up (by
deleting their entities (though that will cause other problems later
when the hierarchy doesn't own the entities)), thus plugging a memory
leak when parsing passage text.

libs/ecs/hierarchy.c

@@ -477,6 +477,10 @@ Hierarchy_Create (hierarchy_t *hierarchy)
 static void
 hierarchy_destroy (hierarchy_t *hierarchy)
 {
+	hierarchy_InvalidateReferences (hierarchy, 0, hierarchy->num_objects);
+	for (uint32_t i = 0; i < hierarchy->num_objects; i++) {
+		ECS_DelEntity (hierarchy->reg, hierarchy->ent[i]);
+	}
 	free (hierarchy->ent);
 	free (hierarchy->childCount);
 	free (hierarchy->childIndex);