Mark unavailable and deprecated symbols #998
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Fixes #843.
This PR adds the ability to detect unavailable and deprecated symbols, as well as the related messages.
In the generated documentation, an unavailable or deprecated symbol is marked with a strikethrough of its name, and adds a box with the unavailable message or the deprecated message when expanding the symbol.
We are already using this in production for the PSPDFKit for iOS API documentation. (See https://pspdfkit.com/api/ios/Classes/PSPDFDocumentViewLayout.html#/c:objc(cs)PSPDFDocumentViewLayout(py)pagingEnabled for an example of a deprecated API.)