New Furniture: Standing Tank

Adds a piece of furniture called a "standing tank" to the game, constructed from four metal tanks and a water faucet. It acts like a larger, metal version of the wooden keg, in that it can be used to store large quantities of liquids in a single, central place. The main difference between the two is that the wooden keg holds 600 units of liquid, while the standing tank holds 1200.
None of the other metalworking furniture constructions use welding, though - since these things don't need to be held on to an accelerating, jumping car, I'd just assumed they were hammered together - these are generally very makeshift constructions, after all, and to the best of my knowledge the game lacks bolts.