Support archive metadata

Files inside zip do have zip-related metadata. We need to get rid ot them.

added information leak label

Python3 is awful as fuck. You can either add an archive member with the write method that takes a file, but then you can't set its zip-related metadata, or use the writestr one, but since it's expecting a str and not bytes, it won't work for binary files.

Done in c186fc42

closed

This also needs to be supported in get_meta and not only in remove_all.

reopened

Done in 9e7a4bd2

closed