.NET - Correctly deserialize callback arguments

[RomainMuller]

In #395, a shallow fix was introduced to solve an issue where the Callback arguments were not parsed out to a native object, and instead resolved to JObjects.

As we are moving forward to pass "value types" (also known as "data types") as plain JSON objects (and not by reference), this problem might become more prevalent and require more complex handling (including support for parsing out Date and Enum Constants).

The compliance test in #395 exercises some of this behavior (might benefit from being enriched to include Date and Enum assertions, too).

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