EXIF reader & writer

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local libexif = require'libexif'

A ffi binding of libexif, the library for reading and writing EXIF information from/to image files.

Help needed

Currently there's the binary, sanitized header and the module stub that returns the clib object so the library is usable at ffi level with the aid of libexif docs. A Lua-ized API is missing, but the library is otherwise usable without it.