Revert the PlayerCraftingSpeed and PlayerMiningSpeed to base of 1 instead of zero.

[Ranakastrasz]

To slow down speed, you have to set it to negative. However, player Movement speed doesn't match this behavior.

I think having 1 as the default makes more sense than zero.

Or, at the very least, put it in the API documentation, so people don't have to experiment to learn it.