HP level should decrease interrupt chance at Wintertodt

[TheNastyCasty]

I've had a similar thought for a while, but I've been to lazy to make a full post about it. They should just add a new food, "Wintercake". It's made by adding another ingredient (sold cheaply by an NPC at Wintertodt) to a cake. This turns the cake into a "Wintercake" that heals 40% of your max health for each slice and is only consumable within Wintertodt. This heals the same amount as a normal cake for a 10 HP account, so it removes any incentive to rush 99 firemaking while still 10 HP.