Add an UI for modifying controls for PC

I add a new UI for modifying control keys for PC, and remove the old one. In fact, I'm not sure how to design it. Here is the one I made, feel free to modify it:
![pspui](https://f.cloud.github.com/assets/3243757/396034/5c92a088-a815-11e2-97d9-daf20cf44305.JPG)