feature idea: add button to reset board to original position

[simondorfman]

After using the rotate and arrow buttons to help see connections in a different way, sometimes you want to quickly reset back to the original board position. It would be cool to have a button that did that reset.

Not sure where such a button should go in the UI. Maybe something similar to the rotate arrow buttons and near them so it's obvious it affects the same state that they do.

Maybe something like this:

Also, it would be cool if this button only showed up when it was relevant, that is, after the user has clicked a rotate or arrow button.