Bugfix Update [SEE DESC}

Added stained clay, coal block, and hardened clay Block IDs
Added stained clay and carpet block Metas
Fixed bug with sticky retract bailing out but not unsetting arm
Fixed autocomplete not working when not at the first character, fixes
#64
Added furnace recipes for hardened clay and coal and coal blocks

source/Piston.cpp

@@ -173,6 +173,7 @@ void cPiston::RetractPiston( int pistx, int pisty, int pistz )
 		)
 		{
 			// These cannot be moved by the sticky piston, bail out
+			m_World->SetBlock(pistx, pisty, pistz, E_BLOCK_AIR, 0);
 			return;
 		}