[new] sysutils/fzf a commandline fuzzy finder

Hi,

Here is a port of fzf ( https://github.com/junegunn/fzf ), a tool that
can be used with vim and friends to quickly find files (really quick!).

I added a pledge(2) call (stdio rpath wpath cpath tty proc exec inet),
which isn't ideal. My main goal is to use it as an entry point for when
Go gets execpromises.

DESCR:
Interactive Unix filter for command-line that can be used with any list; files,
command history, processes, hostnames, bookmarks, git commits, etc.

OK?

Cheers,
Aaron

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