message: Rename pullFood() to pullResource() in preparation of reuse
diff: #include <algorithm>
  -static int pullFood(int& food, int amount)
  +static int pullResource(int& resource, int amount)
  {
  - if (amount <= food)
  + if (amount <= resource)
  {
  - food = food - amount;
  + resource -= amount;
  return amount;
  }
  else
  {
  - int ret = food;
  - food = 0;
  + int ret = resource;
  + resource = 0;
  return ret;
  }
  }
  @@ -43,7 +43,7 @@ static inline void pullFoodFromStructure(FoodProduction* producer, int& remainde
  if (remainder <= 0) { return; }
  int foodLevel = producer->foodLevel();
  - int pulled = pullFood(foodLevel, remainder);
  + int pulled = pullResource(foodLevel, remainder);
  producer->foodLevel(foodLevel);
  remainder -= pulled;
  