Sign assemblies

[ermshiperete]

This PR creates strong-named versions of the assemblies. While this doesn't have any benefits in regards to security it helps those projects that (for whatever reason) are required to create strong-named assemblies because all dependencies have to be strong-named as well.

Since signing an assembly doesn't help in any ways in regards to security, it doesn't hurt if we add the key file to the repo.

This PR also adds the version and file version to the assemblies. It also fixes the nuget package version for Sandwych.QuickGraph.Core.

[oldrev]

Thanks for your contribution, I'll find some spare time to fix the CI problem(s).