Removed ReflectionExtensions,

because the purpose of Hyprlinkr is to deal with RESTful hyperlinks, not
extending Reflection. There's no reason to publish an API that has no
relation to the main purpose, and Hyprlinkr shouldn't take on that support
responsibility.
Removed Arg<T>,

because too many libraries already introduce similar classes to model
anonymous data for use in expression, like e.g. Moq's It.IsAny<T>().

The only reason Arg<T> currently exists in the Hyprlinkr is because it's
used in a single unit test. This doesn't seem to justify another type,
which seems to only serve a purpose of syntactic sugar. Clients of
Hyprlinkr kan easily define their own Arg<T>, or reuse an existing
equivalent, like Moq's It.IsAny<T>().
Made GetBodyMethodCallExpression internal,

because, like other extension methods, this one shouldn't be public,
because it doesn't particularly relate to the main purpose of Hyprlinkr to
extend LINQ expressions. It should not be the responsibility of Hyprlinkr
to support extensions for LINQ expressions.
Made GetMethodInfo internal,

because, like other extension methods, this one shouldn't be public,
because it doesn't particularly relate to the main purpose of Hyprlinkr to
extend LINQ expressions. It should not be the responsibility of Hyprlinkr
to support extensions for LINQ expressions.
Moved GetParameterValue to test project,

because, like other extension methods, this one shouldn't be public,
because it doesn't particularly relate to the main purpose of Hyprlinkr to
extend LINQ expressions. It should not be the responsibility of Hyprlinkr
to support extensions for LINQ expressions.

Additionally, this public method was only used by a test setup method, but
served no purpose related to Hyprlinkr.
Made GetBodyMethodCallExpression private,

because it wasn't used by any other class in the code base.