This PR cleans up tthe settings that where scattered allover oscarapi.
This was needed to introduce yet another setting: FILE_DOWNLOADER_MODULE.
This makes it possible to override the file downloader, so we can make a bit smarter downloaders that listen to cache headers and such. In the future a smart downloader might be contributed to oscarapi, but it needs internal testing first,
This PR cleans up tthe settings that where scattered allover oscarapi. This was needed to introduce yet another setting: FILE_DOWNLOADER_MODULE. This makes it possible to override the file downloader, so we can make a bit smarter downloaders that listen to cache headers and such. In the future a smart downloader might be contributed to oscarapi, but it needs internal testing first,