* Fix handle of hashed file not closing
* Limit concurrent downloads to a maximum of 8
* Dynamically increase job size to avoid downloads appearing stalled
* Set downloader settings to avoid RAM and timeout issues
* Improve logging around downloads
* Adds more logging when starting stopping downloads
* Improves error message when GameFileSource download fails
* Stops logging errors when archive isn't available on WJ CDN
* Add retry mechanism to SingleThreadedDownloader
* Update CHANGELOG.md
* Remove hard limit for download threads
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Co-authored-by: UrbanCMC <UrbanCMC@web.de>
