Adds lettuce to the game [prereq]
Adds craftable blts
Duct tape recipe!
Only add items to crafting options when we have a line of effect to them. Fixes #995.
Prevent smokers from generating smoke on the other side of walls. Fixes #849.
Prevent NPCs from targeting player through walls. Fixes #58.
Prevent spent shell casings from spawning on walls, which sometimes caused them to tunnel to the other side.  Fixes #733.
Adds plastic to recipe.
Recipe improvement.
Adds thread to recipe.
Minor diversification.
Fix laws of physics (again, this time rregarding walls), make ductape with broadsword. Also, sammich