feat: support C# 8 and nullable reference types #245
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natemcmaster
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Resolves #240
This updates the project to compile using C# 8.0 and takes advantage of the nullable reference types feature. Beyond adding nullability annotations, this uncovered a few places where null ref exceptions were possible, so a few minor behavior changes were required.
This also motivated a refactor of CommandLineParser to use pattern matching instead of an enums.
Includes workarounds for dotnet/roslyn#33199 and xunit/xunit#1897