Lataa NAPS2 8.4.0

Changes in 8.4.0:
- Added "Manual Duplex" (under "Reorder") as a clearer way to combine front and back sides scanned separately
- This is meant to replace the "Interleave" buttons, which will be removed in a future version
- Checking "Reverse back sides" is equivalent to using "Alternative Interleave"
- Unchecking "Always show preview" will add a separate button for one-click actions like before
- Admins can use "HideManualDuplex"/"HideInterleave" to control visibility
- Crop: Added a middle handle for moving the whole selection
- Crop/Split/Combine: Added arrow key controls
- Added help text to some image forms
- Linux: Added a "Theme" setting to manually switch between Light and Dark mode
- Mac: Custom page sizes are no longer shown for feeders with the Apple driver (as they don't work)
- Mac: Fixed keyboard shortcuts for non-QWERTY keyboard layouts
- Mac: Fixed flatbed/feeder detection with the Apple driver
- Fixed the "Maximum quality" option not being retained after cropping
- Fixed the "Black and White" keyboard shortcut not being editable in Keyboard Shortcuts
- Fixed an issue with email attachments not working when Thunderbird is already open
- Console: The --device option can now match the device ID as well as the name
- Sane: KeyValueOptions set in profile XML now support true/false and are retained when editing a profile
- Escl: Fixed a misspelled feeder status value and added an admin page for better compatibility
- Sdk: Added MetadataCaps.ProtocolVersion