Add Java 16 Linux matcher variant to HtmlDecorator

The Java 16 Javadoc generator has changed the HTML structure once again
even compared to Java 15. I adjusted the matching in HtmlDecorator and
also fixed CoverageTestCase. Most methods there I just made to work
quickly, but method 'testInnerAspect()' I actually refactored. Some
other methods could (probably should) be restructured in a similar
fashion, but for now I just wanted to understand what the test does and
see how much work it would be to refactor it. But finally, I just want
to get the GitHub CI build running on Java 16.

TODO: I did not check if the decorated HTML actually looks OK and am
unsure if the tests cover that sufficiently, I never reviewed the tests.
It would also be better to do regex matches instead of looking for
variants of fixed strings or maybe even to operate on a DOM. But I am
not in a mood to refactor that tonight.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

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