Added a --resume-file argument to butler extract #214
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I added the ability to interrupt and resume extractions part way through using a lot of existing features in the stack. itchio/hush provides an intervalSaveConsumer that can store the results of a partial extraction. And itchio/savior can use this as part of the normal extraction.
My code conditionally creates a saveConsumer if the --resume-file argument is provided and gives it to the extractor instead of a nil checkpoint to ex.Resume()
I haven't worked with golang before, but I compiled a local version of butler and used it with success.