Adds an indicator to the jumpsuit slot showing current suit sensor status.

DISCLAIMER: THIS IS CURRENTLY COMPLETELY BROKEN AND I HOLD NO RESPONSIBILITY FOR ANYTHING THAT HAPPENS IF THIS GETS MERGED.

Intended function:
Adds four bars in the top right corner of the jumpsuit slot that show the current sensor mode of the worn jumpsuit, by lighting up one of the bars, and none are lit if there is no jumpsuit, or the jumpsuit has no sensors.

Current function:
Break things

Issues to be fixed:
1. On first joining the game the entire UI is invisible, appears after reclogging.
2. Even when the UI is visible, the indicator lights never appear.
3. Runtimes out the ass, see http://hastebin.com/qutoqupure.coffee

Let me know if anyone has any suggestions for how to fix this.
The null.has_sensor is because you never check to ensure U exists.
change this line to

```if(U && U.has-sensor != 1)```