Major upgrades and new commodity market live!

First major overhaul completed and live, including:

* 8 more resource types including rare diamonds, gold, and silver. All of the resources have their own market volatility patterns and stratum based spawning so more stuff spawns at higher distance.

* A commodity stock market where you can stash up resources and sell em when it gets high... or turn auto sell back on and ignore it so the window disappears. Buy resources for double their sell price and automatically sell off any excess you receive to the bank. Auto sell is turned on for all resources at the beginning of a new level by default.

Also included is a major balancing overhaul to make upgrades feel more rewarding and build up to be that much more sweet. The start location has been moved to the center of the map to give more options for expansion and there has been a major graphics overhaul.

I hope you have fun playing RailRL!