Especially in our item thumbnails, there's a lot of messiness about what the URL protocol is. There are also some SWF assets whose "URLs" are just saved as paths.
In this change, we start processing all our outputted URLs through a `sanitizeUrl` function, which tries to massage it into an `https://images.neopets.com` URL, and warns if it cannot.
This also warns on some intentionally-different URLs, like our April Fools prank item lol
Anyway, I love functions like this, because the warnings always help me discover the data problems! I wasn't aware of the path-only SWF URLs, for example, until this script started warning about the URL parse errors!
Here, we read URLs out from the swf_assets table, including SWFs, manfests, and everything referenced by the manifests.
There are a few data-polishing tricks we needed to do to get this to work! Most notably, newer manfests reference themselves, but older ones don't; so we try to infer the manifest URL from the other URLs. (Our database caches the manifest content, but not the manifest URL it came from.)
Just working on making an images.neopets.com mirror, just in case! To start, I'm extracting all the URLs we need to back up; and then I'll make a separate script whose job is to mirror all of the URLs in the list.
