Enable configuration for curly braces style (e.g yes/no when adding parameter null checks)

[bexxx]

also add option to ad required using instead of fully qualifying the exception.

[Rpinski]

Similar topic as in #84 or #179: The best would be to have a VS-provided configuration system for coding styles. It's planned in future Roslyn releases: https://github.com/dotnet/roslyn/issues/7064, https://github.com/dotnet/roslyn/issues/4616