Parse clip-rule on the first child of clip-path element

[nguyenalter]

This PR solves the issue #324.

Previously, the clip-path element always clips with nonzero rule, for example:

<svg width="600" viewBox="0 0 600 600" xmlns="http://www.w3.org/2000/svg" version="1.1">
  <clipPath id="clip-evenodd">
   <!-- Setting `evenodd` here does not work  -->
    <path d="M30,10 h370 v70 h-370 v-70 M50,20 h100 v50 h-100 v-50 z" fill="none" stroke="red" clip-rule="evenodd"/>
  </clipPath>
  <line x1="30" y1="40" x2="400" y2="40" stroke="red" clip-path="url(#clip-evenodd)"/>
</svg>

New behavior: the clip-path will use the clip-rule attribute of the first child to determine which rules to clip the whole clip-path element. If there is no clip-rule specified in the child, use the clip-rule attribute from clip-path element directly.

Note: This PR does not handle different clip-rule values inside clip-path element.

[HackbrettXXX]

Thanks! The code looks good. Please revert the changes in the dist folder. The files are only updated on release.

[nguyenalter]

Thank @HackbrettXXX, I reverted the changes.

[HackbrettXXX]

Looks good.