Downloads refactor - use a common downloader across all APIs #87
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Refactor code to put common downloader code all together.
Downloads are still async but now have 10 workers rather than as many workers as there are downloads.
Also fixed an area where I could see a possible bug occuring (but didn't see in the wild) where the ids for arxiv files were found independent of the pdf and supplementary files urls which means that if a pdf (or supp files) url was missing then paper would be put in a folder with the wrong id.
We handle retries within each download not in bulk at the end. This could be adapted if we want.