message: Use initializer syntax for ProductionCost
diff: @@ -18,18 +18,18 @@ using ProductionTypeTable = std::map<ProductType, ProductionCost>;
  */
  const ProductionTypeTable PRODUCTION_TYPE_TABLE =
  {
  - {ProductType::PRODUCT_NONE, ProductionCost()},
  + {ProductType::PRODUCT_NONE, ProductionCost{}},
  - {ProductType::PRODUCT_DIGGER, ProductionCost(5, 10, 5, 5, 2)},
  - {ProductType::PRODUCT_DOZER, ProductionCost(5, 10, 5, 5, 2)},
  - {ProductType::PRODUCT_EXPLORER, ProductionCost(5, 10, 5, 5, 2)},
  - {ProductType::PRODUCT_MINER, ProductionCost(5, 10, 5, 5, 2)},
  - {ProductType::PRODUCT_TRUCK, ProductionCost(3, 6, 3, 2, 1)},
  + {ProductType::PRODUCT_DIGGER, ProductionCost{5, 10, 5, 5, 2}},
  + {ProductType::PRODUCT_DOZER, ProductionCost{5, 10, 5, 5, 2}},
  + {ProductType::PRODUCT_EXPLORER, ProductionCost{5, 10, 5, 5, 2}},
  + {ProductType::PRODUCT_MINER, ProductionCost{5, 10, 5, 5, 2}},
  + {ProductType::PRODUCT_TRUCK, ProductionCost{3, 6, 3, 2, 1}},
  - {ProductType::PRODUCT_MAINTENANCE_PARTS, ProductionCost(2, 2, 2, 1, 1)},
  + {ProductType::PRODUCT_MAINTENANCE_PARTS, ProductionCost{2, 2, 2, 1, 1}},
  - {ProductType::PRODUCT_CLOTHING, ProductionCost(1, 0, 1, 0, 0)},
  - {ProductType::PRODUCT_MEDICINE, ProductionCost(1, 0, 2, 0, 1)},
  + {ProductType::PRODUCT_CLOTHING, ProductionCost{1, 0, 1, 0, 0}},
  + {ProductType::PRODUCT_MEDICINE, ProductionCost{1, 0, 2, 0, 1}},
  };
  