SteamWorld Dig 2 - cog details, boss battles, timeline placement

- you can now reassign cogs used to upgrade various gear on the fly
- this lets you change armor and weapon stats, and more
- there will be more boss battles this time around
- one boss is supposed to be something of a throwback to the last boss from the original game a
- this game takes place between the events of the first game and SteamWorld Heist