Adding copper into progression

The new progression of tools is now: Wood - Stone - Copper - Iron This will add copper tools that can mine iron and also a blast furnace made of copper the same way it is made from iron right now that is 1.5x faster than the furnace and it can smelt raw iron. The blast furnace we have right now would be faster than the copper one and it could smelt ores that the copper one cant like gold and ancient debris. This feature would make the game more interesting and a little bit more realistic