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* Export and detect with TensorRT engine file

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```
export.py:310: DeprecationWarning: Use build_serialized_network instead.
  with builder.build_engine(network, config) as engine, open(f, 'wb') as t:
```

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@imyhxy it seems we can't apply the deprecation warning fix because then export fails, so I'm reverting my previous change here.

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Accepts all arguments now by default resolving https://github.com/ultralytics/yolov5/issues/5600

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Partially addresses invalid mAPs at higher confidence threshold issue https://github.com/ultralytics/yolov5/issues/1466.

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