RFR: 8267551: Support loading images from inline data-URIs [v16]

[Michael Strauß]

On Sat, 5 Jun 2021 17:31:17 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> This PR adds support for loading images from [inline data URIs](https://en.wikipedia.org/wiki/Data_URI_scheme), which is also widely supported by web browsers. This enables developers to package small images in CSS files, rather than separately deploying the images alongside the CSS file.
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   added comment, simplified DataURI.matchScheme()

Since this implementation doesn't surface any new API, it will not prevent us from removing it at any future time when the "data" protocol might be supported by the JDK.

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PR: https://git.openjdk.java.net/jfx/pull/508