Chiseling underside now only checks if the block and the one above it are raw stone.

Can now chisel the underside of bricks, cobblestone, smooth stone and planks without restrictions.
Added Scrap Metal icons
fixed broken pottery recipes. derp
Added Crucible block(only partially complete) and fixed some bugs with the alloy system.
Added some checks to prevent a NPE
Merge pull request #153 from Kittychanley/patch-1

Chiseling underside now only checks if the block and the one above it ar...
Merge https://github.com/Deadrik/TFCraft