Saber: Handwritten Notes

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• Big improvements for Onyx Boox devices with increased tool support and miscellaneous fixes thanks to zinstack625 on GitHub.
• Improved speed of PDF imports.
• Improved loading times for notes containing large PDFs (they're now loaded page by page rather than all at once).
• Fixed an issue with saving PDFs from the long-press dialog.
• Fixed a bug where the wrong tool would be selected when turning off the eraser, thanks to ComputerElite on GitHub.