New port: security/peda: Python-based GDB extension for exploit development and debugging

PEDA (Python Exploit Development Assistance for GDB) is a plugin for GDB.
It extends GDB with a colorful text-based UI making it easier to work with
the debugger.

Note that PEDA requires that GDB is compiled with Python support.

Its key features are:

• Enhance the display of GDB: colorize and display disassembly codes, registers, memory information during debugging.
• Add commands to support debugging and exploit development.

WWW: http://ropshell.com/peda/

Reviewed by: mat
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D18433