Welding tool sprite updates

"Oh boy another stupid simple sprite replacement by paprika"

YOU THOUGHT WRONG

![ass](https://cloud.githubusercontent.com/assets/7247232/4536018/9d120658-4dbe-11e4-9139-2c5cb6d4434a.png) 
![2](https://cloud.githubusercontent.com/assets/7247232/4536041/d5fb7062-4dbe-11e4-87f1-bbc292d5fd2d.png)
![3](https://cloud.githubusercontent.com/assets/7247232/4536043/da338746-4dbe-11e4-9b73-6732adafb512.png)
![4](https://cloud.githubusercontent.com/assets/7247232/4536044/ddffabac-4dbe-11e4-8b5a-d190e7f155e2.png)
![ff](https://cloud.githubusercontent.com/assets/7247232/4536019/9dcb8dee-4dbe-11e4-96fe-e35b1df6c77f.gif)

DYNAMIC WELDING TOOL FUEL LEVEL FEEDBACK

AND EMPTY FUEL BLINKING

!!!