message: Use range-for loop in Mine::pull
diff: @@ -263,10 +263,8 @@ int Mine::pull(OreType type, int quantity)
  {
  int pulled_count = 0, to_pull = quantity;
  - for (std::size_t i = 0; i < mVeins.size(); ++i)
  + for (auto& vein : mVeins)
  {
  - MineVein& vein = mVeins[i];
  -
  if (vein[type] >= to_pull)
  {
  pulled_count = to_pull;
  