Hardened clay

There are actually two blocks related to hardened clay for the PC version:  Hardened Clay and Stained Hardened Clay.  The stained hardened clay is the result of applying a dye.  It is a little bit different than Wool.  I updated the smelting data and crafting recipes for a comprehensive change.

The rename of the Wool Block class was a mistake, but I am not sure how to remove it from the pull request.