New ERT uniforms/in-atmosphere armor

Adds new ERT uniforms, and makes normal ERT members spawn with them. The team leader still spawns with the formal uniform. 

![](http://puu.sh/aT10L/9e8c3adaa6.png)

Adds lockers with the new uniform, the old uniform, and the combat turtleneck to the ERT base. 

Adds new in-atmosphere ERT helmets and armor, and adds them to the ERT base. 

![](http://puu.sh/aUjKA/b8ddf4079d.png)

Fixes a minor error with the ERT engineering hardsuit's description.