Utilize DOMPurify hooks to preserve <use> elements in playground mode

[listopadiya]

Closes #155.

<use> tags were filtered out after sanitization, but with DOMPurify hooks this problem can be solved (regular expression still filter out links to external resources in the interest of security).

Can be checked in playground with following SVG code:

<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100" viewBox="0 0 200 100">
  <style type="text/css">
    use { fill: orange; }
  </style>
  <g class="special" style="fill: blue">
    <g id="face">
      <circle cx="50" cy="50" r="40" stroke="#000000" />
      <circle cx="30" cy="40" r="5" fill="#000000" />
      <circle cx="70" cy="40" r="5" fill="#000000" />
      <path
        fill="none"
        stroke="#000000"
        stroke-width="3"
        stroke-linecap="round"
        d="M30,60 C30,80 70,80 70,60" />
    </g>
  </g>
  <use xlink:href="#face" x="100" />
</svg>

Before PR

After PR