[Metalab] NFP implementation in C++

I'm currently working on implementing 2D bin packing (nesting) for polygons. Basically it's about packing laser cut or cnc-milling models as tightly as possible to use material as efficient as possible. The first step for that to happen is to implement the no-fit polygon optimization - which i did :) Currently it runs rather slow because i still have edge case problems with floating point and so I'm using infinite precision (rational numbers), but it works and is robust even for tricky edge cases. There's a description and illustration of the no-fit polygon in the README of the GitHub project - Check it out: https://github.com/kallaballa/libnfp greets, amir