Add an optional direction change penalty to the A* calculation

[IceTank]

This change adds additional penalties to changing directions while pathing.
A direction change penalty is useful when you want to mine in instant minable blocks. Baritone is significantly faster when it can sprint while mining. Diagonal tunnels prevent sprint mining, as the bot is slowed down by bumping into the diagonal tunnel walls. Choosing primarily straight tunnels thus increases mining speed.
Even a small amount of penalty, like 0.1, will result in generally straight tunnels while not impacting open terrain travel in a noticeable way.