updates warden and hos formal sprites, add formal officer sprite

Tired of the utility one-piece jumpsuit? Want to buckle a belt around a nice pair of slacks, and straighten a tie to be perfect under your body armor?

Now you can! With the new Formal Uniform Corporate Klothing line! The latest in nanotrasen fashion, not inspired or stolen from any video games!

- Adds new formal uniform for security officers
- Replaces warden and HoS formal uniforms with this

![formalnorm](https://cloud.githubusercontent.com/assets/7247232/5451159/590ba1a4-84c2-11e4-98e3-13bf5edb343b.png) ![hosformal](https://cloud.githubusercontent.com/assets/7247232/5451160/59a6a19a-84c2-11e4-917e-907628078ec9.png)

![ss 2014-12-16 at 01 32 38](https://cloud.githubusercontent.com/assets/7247232/5451250/6e9c655c-84c3-11e4-96fa-83f0d409330c.png) ![ss 2014-12-16 at 01 32 56](https://cloud.githubusercontent.com/assets/7247232/5451256/7dd30cba-84c3-11e4-8bce-b53e658ef96e.png) ![ss 2014-12-16 at 01 33 07](https://cloud.githubusercontent.com/assets/7247232/5451258/7f40e766-84c3-11e4-81d5-b7fbaf08f518.png)


Sprite credit to Not Ausops

Edit: Also made the security belts stand out more when equipped on armor 
![ss 2014-12-16 at 02 42 15](https://cloud.githubusercontent.com/assets/7247232/5452223/488a46ae-84cd-11e4-9511-f925d15bb60c.png)

Fixes https://github.com/tgstation/-tg-station/issues/6431