Progress on lava furnace. (about 65% done)

Yes, I made some progress on the lava furnace but it's not that easy to make so it doesn't work correctly yet. It's a little bug, but you can see the block and the interface now(textures by @cman8396). I also made a GuiHandler, obviously, so I would be glad if it's used as the main GuiHandler for all the GUI's.