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Resolves #8 : Add support for metadata exported by the ARRI Reference Tool#201

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JGoldstone wants to merge 1 commit intomainfrom
issues/0008-arri-metadata-from-json
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Resolves #8 : Add support for metadata exported by the ARRI Reference Tool#201
JGoldstone wants to merge 1 commit intomainfrom
issues/0008-arri-metadata-from-json

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The ARRI cameras that can record lens metadata for entrance pupil offset (and effective focal length) do not have command-line tools that generate the CSV files currently supported by camdkit for ARRI camera metadata import. Instead, those cameras are supported by a command-line tool that is a version of the ARRI Reference Tool, said command-line tool being named art-cmd, that generates JSON.

This PR adds support for importing JSON metadata generated by the command-line version of the ARRI Reference Tool. It contains test metadata from the ALEXA 35 Extreme, the ALEXA 265, the ALEXA 35, the ALEXA Mini LF, the ALEXA LF, the ALEXA Mini and the ALEXA SXT. The source code contains comments noting special cases (e.g. on some older cameras, rather than omitting physical width and height of the sensor, a size of 0.0 x 0.0 is emitted) of which someone adapting the logic embodied in this PR into their own code would want to be aware.

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