devel/elf-dissector: New port, GUI Tools for ELF inspection

ELF-Dissector is a tool from the KDE Community for doing
visually pleasing inspections of, and optimizations on,
ELF files, including whole applications.

The tool is at an early stage of development (and needs work
on FreeBSD), but is, in itself, quite useful for chasing
unused dependencies and the like.