[MAP] Labor Camp Vending

Prisoners no longer need to choose between an overwhelming variety of
snacks and drinks.  Instead, they are treated to a meal of tofu and ice,
with candy corn for desert.

The vendor's sprite is just a recolored snack vendor:
![5cpq3](https://f.cloud.github.com/assets/4391822/1505866/588413f0-48f1-11e3-936c-46d0094241ce.png)

Also apparently adds input/output areas to the labor camp that vanished between mapping and committing.