Handheld crew monitor

This is the third time I've made this PR, mostly because I'm an idiot who cannot into GitHub.

Anyway, in a nutshell, it's a portable crew monitor. You can carry it around in your pocket and on your belt. It's dispensable from NanoMed Plus machines, which have a stock of two by default. This is intended to make suit sensors more worthwhile to use, and to ease the lives of doctors who choose to act as paramedics.