Updated EnvelopeHistoryQuery to include a new `Status` parameter for describing the envelope's status. Modified the `ReferenceType` property to return `ReferenceType.System` when neither the envelope's `User` nor the `Receiver` is defined.
Updated ReadEnvelopeHistoryQuery to include the `Status` parameter and set default values of `null` for `Envelope` and `Receiver`, ensuring consistency with the base class.
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