Add a filename ignore list to ZipArchiveReader to filter out superfluous
OS-generated files from archives during the import process. In addition
to decreasing the size of files imported this allows imports of some
incorrectly-constructed archives. An example is the case of having
a __MACOSX directory next to a single directory with the actual files -
filtering out the former at ZipArchiveReader allows the fallback added
in #6170 to work.
