Use more modern SVG sprite compiler - #4665

Tested on an ARM64 arch node:16 docker container; the install and npm run build both worked. When I diff the files in dist/img between the ARM64 container and an x86_64 container, there are no differences, but I have to admit I'm not sure how to compare the sprite sheet to previous builds because it is different, but maybe not in meaningful ways.

Here's a symbol from the sprite sheet from the old dist (as used by Tock; USWDS@2.13.0):

<symbol viewBox="0 0 24 24" id="zoom_out_map" xmlns="http://www.w3.org/2000/svg">
  <path fill="none" d="M0 0h24v24H0z"/>
  <path d="M15 3l2.3 2.3-2.89 2.87 1.42 1.42L18.7 6.7 21 9V3h-6zM3 9l2.3-2.3 2.87 2.89 1.42-1.42L6.7 5.3 9 3H3v6zm6 12l-2.3-2.3 2.89-2.87-1.42-1.42L5.3 17.3 3 15v6h6zm12-6l-2.3 2.3-2.87-2.89-1.42 1.42 2.89 2.87L15 21h6v-6z"/>
</symbol>

And here's the same symbol from the current build:

<symbol id="zoom_out_map" viewBox="0 0 24 24">
  <g enable-background="new 0 0 24 24">
    <g>
      <rect fill="none" height="24" width="24"/>
    </g>
    <g>
      <g>
        <g>
          <path d="M15,3l2.3,2.3l-2.89,2.87l1.42,1.42L18.7,6.7L21,9V3H15z M3,9l2.3-2.3l2.87,2.89l1.42-1.42L6.7,5.3L9,3H3V9z M9,21 l-2.3-2.3l2.89-2.87l-1.42-1.42L5.3,17.3L3,15v6H9z M21,15l-2.3,2.3l-2.87-2.89l-1.42,1.42l2.89,2.87L15,21h6V15z"/>
        </g>
      </g>
    </g>
  </g>
</symbol>

The main path elements are the same (just using different formatting, but the result should be the same). Most of the rest looks like it accomplishes the same set of things, but I'm not familiar enough with SVG to say for sure if the <path fill="none" d="M0 0h24v24H0z" /> and the <rect fill="none" height="24" width="24" /> accomplish the same thing.

EDIT: I also checked it out on an M1 Mac and it works a treat there as well. 😄 Thanks @thisisdano

I want to hold this one for a little more testing, but I agree that it looks good so far. Let's just dig into the compiler's options, test the icons at a few sizes with our usual classes, and prep this for release after 3.0.1