Added hvd as a trace file type for HostVehicleData

[thempen]

Added hvd as a supported trace file type for HostVehicleData

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We are using OSI to send data within our test vehicle. Within the vehicle, we are just sending HostVehicleData information, because other data is not required. To have data for testing and evaluation, tracing that HostVehicleData should be available in a general fashion.

This change is just an extension in the naming conventions, which will allow saving HostVehicleData as hvd files.

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• [x] My suggestion follows the style and contributors guidelines.
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