Apache listing parse improvements

[plicease]

This adds:

• a much more rigorous testing framework for Apache that uses docker images to generate reproducible output for various apache formats that do not rely on external sites that may change from time to time. The docker images are only used at development time and the output is stored in the repository, so you do not need docker to run the tests.
• Handle the default apache file listing, which doesn't include sizes, timestamps, etc. For the data that we cannot parse from the listing we use undef.
• Ignore certain known navigation links.