feat(python): implement Mapping protocol for IFD and GeoKeyDirectory #148
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We now support passing IFD and GeoKeyDirectory to
dict()constructor.Change list
keys,__iter__,__getitem__to theImageFileDirectoryandGeoKeyDirectoryPython classes. This means that we now implement the Python "Mapping Protocol", so we can calldict(ifd)anddict(geo_key_dir).__eq__onto ifd and geo key dir classes. This makes it easier to test the dict conversions because we can check actual equality of instances.Closes #145