Ghetto Chemistry: Breaking Bathtub

![lhvcplo](https://cloud.githubusercontent.com/assets/4081722/3156676/4cdc26e2-eae4-11e3-8c57-2f8804e6f782.png)
Adds a Bathtub to various areas in Maint, and the bathrooms. Sprites are by Flashkirby from BS12.

These bathtubs can hold a ton of reagents, but come pre-filled in some occasions, and cannot be moved.

They can be used for ghetto mixing of space drugs.

Various food items from vending machines now have base chemicals and such inside of them, so you can grind down candy bars and such for the reagents you need for that tasty mindbreaker toxin.

This also adds a large syringe that holds 50 units, available from the autolathe.

I'm still testing this, so don't merge it.