Hyphenate Filenames

[ghost]

Originally #348, by @tomschr:

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Related to issue #339.

This PR contains the following changes:

• Create filename template
• Enable ZERO WIDTH SPACE (U+200B) in parameter ulink.hyphenate
• Minor comment and linebreak fixes
• Add hyphenation testcases

The result will look like this:

I'm not sure if we should enable it. Please DO NOT merge it for the time being, as we should investigate it a bit further. It's just a "proof of concept" which we can play around, but I wouldn't want to see it in production code yet.

At the moment, we should keep in mind the following:

• Our text is justified. This could lead to bigger gaps in the text if the filename cannot be broken at some characters.
• Links should be hyphenated as well; this isn't covered in this PR (yet).
• ATM, it seems the filenames are only broken up at the "/" (slash) character. Not sure why other characters are not taken into account.
• We should test it with the latest FOP 2.2.

[tomschr]

This is already integrated in the suse2022 stylesheets. Closing this PR.