* Improves handling of Gcode Thumbnails
* Remove Peek support
* Moves GcodeHelper to PreviewHandlerCommon
* Reverts minor change
* Skip unknown data on GcodeHelper.GetBestThumbnail
* Replaces QOI.Core with QoiImage
* Fixes spellchecker
* Reverts changes to NOTICE.md
* Minor QoiImage improvements
* Use custom QoiPixel struct
* Add MIT notice for the QOI reference code
* Fix spellcheck for the MIT notice
* Update NOTICE.md
tweaked notice a bit