Auto Refresh Nuked

The visualiser used to refresh every 2 seconds. But after a while it would hit the limits of API calls, this prevents the user from using both this and chfoo's vis for about an hour. After finding this problem the refresh rate was raised to 4 seconds. However, this was not enough so i decided to throw away auto refresh and replace it by a refresh button.

Reduced the sliders sensitivity when using the scroll wheel as it was completely insane.