Use DetrImageProcessor instead of DetrFeatureExtractor

[TheodorEmanuelsson]

DetrFeatureExtractor gives a deprecation warning so I thought I'd update it to the new DetrImageProcessor. There are some more deprecation warnings that I might fix further down the line when I've understood the transformers codebase a bit more. Didn't make any changes in the text yet.

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[NielsRogge]

Hi,

Thanks a lot for your PR! I actually updated the notebook yesterday with a bunch of updates:

• use of DetrImageProcessor instead of DetrFeatureExtractor
• cleaner calculation of metrics using my new, tiny coco-eval package
• push_to_hub and from_pretrained functionality

[TheodorEmanuelsson]

Nice one!