Currently, the only way to modify whether an item can allow an entity to walk on Powdered Snow is through IForgeItem#canWalkOnPowderedSnow. This method is only called on the item in the Feet armor slot. There should be a way for items in Curios slots to modify this behavior as well, probably as its own method in ICurio that defaults to the in-built Forge method.

Closed by #273