Migrate from QuickGraph to QuikGraph.

[KeRNeLith]

Hello,

I updated the quite old QuickGraph and GraphSharp dependencies to respectively QuikGraph and GraphShape.

Those libraries are using modern C# development workflow, have been ported to .NET Core with a wider support in term of targets. And finally they come with a huge set of unit tests that has helped to debug and fix a lot of issues in both libraries.

Here are the links to both libraries:

• QuikGraph
• GraphShape