Health doll, UI improvements

Many thanks to @RemieRichards 

- Added a new health doll. It displays total brute and burn on a per-limb basis and basically replaces the need to examine yourself if you don't have a health analyzer.
![ss 2014-11-28 at 12 38 11](https://cloud.githubusercontent.com/assets/7247232/5232134/c5fee1aa-76fc-11e4-9bcf-ecd9b7b31211.jpg)

- Reverted temperature icons to the fatter, older and more readable versions.
![temp](https://cloud.githubusercontent.com/assets/7247232/5232137/d151755e-76fc-11e4-9296-0e2472b494f4.png)

- Combined new and old pressure icon styles to make them both more readable and obvious.
![1](https://cloud.githubusercontent.com/assets/7247232/5232144/e7c18d4c-76fc-11e4-9d8b-8325d6f562ec.gif)![2](https://cloud.githubusercontent.com/assets/7247232/5232145/e9f34916-76fc-11e4-95e9-8698b4b80f6b.gif)![3](https://cloud.githubusercontent.com/assets/7247232/5232147/ec20d820-76fc-11e4-983c-2d6335375132.gif)![4](https://cloud.githubusercontent.com/assets/7247232/5232148/ed72ef56-76fc-11e4-8c4d-bd7e5f1c5e46.gif)

- Reverted food to burgers, improved the sprites (previously they were xeno burger sprites for some reason?)
![food0](https://cloud.githubusercontent.com/assets/7247232/5232157/0a738a02-76fd-11e4-9b65-42abd9efa90b.png)

Yes this is a feature but the freeze ends soon so slap a tag on it for when the feature freeze ends.