Add the Roslyn syntax visualizer

[ohadschn]

https://github.com/dotnet/roslyn-sdk/tree/master/src/Tools/SyntaxVisualizer/Roslyn.SyntaxVisualizer.Control

It can be very useful when writing analyzers and refactorings. Besides, it doesn't stand to reason that LINQPad would have it whereas RoslynPad wouldn't :)

[aelij]

100th issue! 🎉

[ohadschn]

Shouldn't you be celebrating having few of these? 😏

[aelij]

As long as they are enhancements and not bugs, I'm happy :)

[ohadschn]

😏