Fetch and embed any external svg's from use-tags

[strindhaug]

Description

A complete fix for https://github.com/qq15725/modern-screenshot/issues/43

I figured out a way to fetch and embed the external svg-files so that both local and external references work. Everything seems to work when I run the tests, and I'm pretty sure I'm only modifying cloned elements.

I changed the test a bit to to check that it behaves correctly with regards to preferring "href" over "xlink:href" too.

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What is the purpose of this pull request?

• [x] Bug fix
• [x] New Feature
• [ ] Documentation update
• [ ] Other

Before submitting the PR, please make sure you do the following

• [ ] Read the Pull Request Guidelines and follow the PR Title Convention.
• [ ] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [ ] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• [ ] Ideally, include relevant tests that fail without this PR but pass with it.

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Name	Status	Preview	Comments	Updated (UTC)
modern-screenshot	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 29, 2023 8:33am