Changes to BlowFish dependency.

[AraHaan]

Note: I changed where the BlowFish depend now lives (Elskom/runtime) For that you might have to add that repository as a submodule and have a github action or something that can auto update it.

Also the BlowFish project on that repository now targets only .NET 6, It should still be possible to compile it in netstandard2.0, but it would require you to create a new project for it for .NET Standard 2.0. It will also require using the .NET 6 SDK and the C# 10 features like the <ImplicitUsings>enable</ImplicitUsings> and file scoped namespaces.

Other than that nothing much should have changed. In that repository the code files are under src/BlowFish/BlowFish/BlowFish.cs and src/BlowFish/Properties/Resources.xaml (Requires the new xaml source generator to generate the C# sources from that xaml file).