Add error/result card.

[bbss]

There are several ways to go about displaying the results of evaluations. Consider displaying it right from the evaluated code, in a pop-up in the middle of the screen or in a seperate card.

Right now the successes and fails of evaluating gets shown in a devcard, but I would like to also wrap the window.console and more importantly window.error. As the devtools are missing from mobile browsers. If this can't be done non-intrusively make it an option for non mobile usage.