Netherrack

Added new crafting recipe.

Use clay ball and blaze powder to get Netherrack.

Cooking Netherrack gives a single brick, same as clay. Additionally, 4 bricks are used to make the nether bricks, same as regular bricks. Functionally, Netherrack is a fire version of clay.
Using a single clay ball in the recipe to explain lack or hardness/blast resistance as it would be very porous.