RFR: 8267554: Support loading stylesheets from data-URIs [v4]

[Michael Strauß]

On Wed, 23 Jun 2021 12:57:10 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> One thing I noticed is that the diffs don't exactly match what you pasted in the CSR (looks like a copy/paste issue). The `Scene::setUserAgentStylesheet` and `SubScene::setUserAgentStylesheet` methods each have three unchanged lines that are marked with the `+` diff indicator. Can you double-check?

I've fixed that, and also cleaned up the `<p>` tags for the new paragraphs.

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PR: https://git.openjdk.java.net/jfx/pull/536