Commodities overhaul

[Rias]

The behind-the-scenes commodity system has received a little overhaul, as well as some of the commodity pricing. Prices for existing commodities from before the overhaul may end up a bit wonky (although we hope we caught everything and converted it nicely).

If you experience any bugs, such as horribly-askew commodity prices or a commodity that won't sell at the market, please report it via the bug command.