Add bulk alternate datastream modification utility

There are various situations in which xattrs used as alternate datastreams (stream) may need to have their naming schemes normalized, or data format type altered en-masse. This is to allow undoing problems arising from misconfigurations where SMB shares to same path may have differing encoding configurations for stream names, different prefixes in use, or different streams_xattr configurations. There may also be times when one configuration style must be migrated to another.

Ideally, this tool should be usable (and safe to use) by a junior tier 2 support member.