Add a reset button to reset individual fields to the default option

[dmnewcomb]

Let's add a button to every editable field in the editModal that will reset the field's value to whichever of the defaultOptions apply to the specific key being edited. This will be especially useful for colors and other default styles that could be hard to get back to. I think having the reset button be grayed out, and then on hover, turn to black is a nice to have. It could also be black from the start.

In the design mockup below, creating a little extra space to the left of the field's title could work well for the reset icon.

[dmnewcomb]

The specific code for the design of the page lives primarily in the return statement of input.jsx and the styling lives in input.css