Rail Recipe Rebalance

Rails now cost iron nuggets instead of ingots.

Detector Rails now cost iron nuggets instead of ingots, and the recipe now mirrors the style of other rail recipes. They also now craft 4 instead of 6.

Activator Rails now cost iron nuggets instead of iron ingots, and the recipe now mirrors the style of other rail recipes. They also now craft 4 instead of 6.

Powered rails now cost gold nuggets instead of ingots, and craft 8 instead of 6.

Rail Crossings now use iron nuggets instead of iron ingots, and they now craft 2 instead of 1.

Copper Rails now craft 8 instead of 6.

Controller Rails now use gold nuggets instead of gold ingots, and craft 2 instead of 6.