Consider using an icon for the "Revert" button

[toolness]

Maybe open iconic's power-standby icon, since the button sort of "resets the code to factory settings"? 😁

Thoughts @iamjessklein?

As an aside, Taeyoon thinks we should come up with a less technical word than "revert", which I generally agree with, but I can't think of a better word. I had considered "reset" at first, but I didn't want that to get confused with the general notion of just restarting the sketch's execution.

[toolness]

Hmm, I just realized that we could alternatively simply get rid of the revert button. Since we now have support for undo/redo as of #33, users can accomplish the same thing by simply undoing until there's nothing left to undo.

[iamjessklein]

It feels like there should be essentially the equivalent of play, stop and undo. Am I oversimplifying?