message: Forward declare StorableResources in StructureManager
diff: #pragma once
  #include "Things/Structures/Structure.h"
  -
  -#include "StorableResources.h"
  #include "Map/Tile.h"
  +
  +struct StorableResources;
  +
  +
  /**
  * Handles structure updating and resource management for structures.
  *
  