Change to have viewbox fit the graphic

[ericsoderberghp]

Rather than have all icon viewboxes be 24x24, change them to align with the edges of the graphic in each icon. This will make it easier for CSS to drive visual alignment, especially vertically.

This might be doable programmatically, by scanning each file, checking placement of the paths and shapes, and then setting the viewbox coordinates accordingly, followed by visual inspection to make sure it looks OK.

If it cannot be done programmatically, it will be a bit of a slog to do it manually. Perhaps set aside a working-together-alone time to make a party out of it.