Handheld crew monitor

This is the third time I've made this PR, mostly because I'm an idiot who can't GitHub.

Anyway, in a nutshell, it's a portable crew monitor. It functions exactly like the static version; showing suit sensor levels of users and their locations (if enabled). 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.