New port: devel/bingrep

Greps through binaries from various OSs and architectures, and colors
them. Current backends:

• ELF 32/64, arm, x86, openrisc - all others will parse and color, but relocations won't show properly
• Mach 32/64, arm, x86
• PE (debug only)

WWW: https://github.com/m4b/bingrep

Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D11162