wip/debugger-git 0.0 NetBSD

PathDB (debugger) has been ported to FreeBSD, but I thought others around here may have some (mild) interest.

Summary: x86/x86_64 debugger with the goal to drop-in replace gdb. We recently finished some heavy refactoring and now focusing on improving performance, robustness, scalability (clusters/multicore systems), DWARF4, OS portability and supported targets. PathDB has a library based design with a CLI interface doing direct function calls. Using C-bindings it should be fairly trivial to extend or add a new front-end in python or other scripting language.