fix(ecau): retry loading image contents on certain HTTP errors #669
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Discogs has started to rate-limit image requests. Adding a retry-loop with exponential backoff on 429/5xx HTTP errors should alleviate most of these issues, and will work for other providers too.
Manually tested on a release with 47 Discogs images. 5 retries is not enough, but 10 seems to work.
Fixes #668.