Filter the files search by the mimetype of the subfile inside a zip.

[picnicpete]

When a zip file is opened, we would filter by the mimetype of the subfiles (as well as the filename)
The mimetype is not given by the zip meta data, so we would need to infer it ourselves.

[picnicpete]

This issue is parked. We don't believe that we need this feature.
There is a branch that has some work in progress code.
62-filter-the-files-search-by-the-mimetype-of-the-subfile-inside-a-zip