New suit sensor toggle menu

This is mostly ported from bay and NT. Credit where it's due. Instead of cycling through your suit sensor modes, which is horrible since they're randomized on spawn and takes a long time, there's a menu you can select different modes from.

New proc for setting suit sensor mode included.

![ss 2014-08-12 at 05 54 51](https://cloud.githubusercontent.com/assets/7247232/3900028/76a239f8-2284-11e4-9094-93087b129722.png)

The setting currently being used by your jumpsuit will be highlighted blue when you open the menu.
```
switch(src.sensor_mode)
    if(0)
```
0 is a valid mode of the sensors, but to make more sense to the user 1 is added so instead of being "Mode 0" it's "Mode 1"

it just looks stupid in the code.