message: Mark StorableResources member functions as const
diff: @@ -107,13 +107,13 @@ struct StorableResources
  // Sum of all resource types
  - int total()
  + int total() const
  {
  return std::accumulate(resources.begin(), resources.end(), 0);
  }
  - std::vector<std::size_t> getIndicesWithStock()
  + std::vector<std::size_t> getIndicesWithStock() const
  {
  std::vector<std::size_t> indicesWithStock;
  