justin-millman / Kvasir / 6209449009

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Use Native .NET6 Nullability Reflection

.NET6 introduced a new reflection facility into the C# standard library that exposes information about the nullability
of various constructs, including properties. These facilities are natively hooked into the nullable references feature,
and are therefore superior to any hand-crafted introspection logic. Cybele previously had such manual logic; that has
been removed, as have the corresponding unit tests. There was only one actual use of those extension methods in Kvasir,
which has been transitioned to the standard library function.

Note that Cybele previously also had APIs for getting the nullability of fields (i.e. variables), events, and function
parameters. It wasn't perfect, though, failing in particular when dealing with generic type parameters and constraints
thereupon. None of these feature are needed for Kvasir, though they can presumably be achieved equivalently using the
standard library reflection facilities.

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