Add and use attention property to highlight controls

[drernie]

A lot of people have trouble funding even the first Run button.

I'd like to do attention: "run' in the level And have that add 'attention' class to the control with the name 'run'

This should clearly highlight that control, perhaps with even a pulsing animation.

http://stackoverflow.com/questions/13955163/imitating-a-blink-tag-with-css3-animations

[drernie]

Now named 'focus'