Changes:

• Halftone now supports externally opening multiple images via file managers
• Halftone now supports opening multiple application instances
• Most Flatpak app stores should now display Halftone as a safe app!
• Image previewer should now retain current zoom level after changing image properties
• The bottom sheet in mobile view is now animated
• Updated design of the controls in image previewer
• Added translation for Occitan
• Updated translation for Italian