Gtk4 and elementary Platform v7

• Migrated to Gtk4
• Update to elementary Platform v7

Maintenance Update

• Update to elementary Platform v6.1
• Fixed app categories
• Fixed Portuguese and Brazilian Portuguese translations - thanks to Hugo Carvalho 🎉️ (@hugok79)

Bugfixes for elementary OS 6

Big thanks to Ryo Nakano 🎉️ (@ryonakano) for the following fixes:

• Respect distro specific close button position (left vs. right)
• Fixed elementary platform version for Flatpak
• Fixed deprecation warnings

Support for elementary OS 6

• Added dark mode support
• Show notification even if the app window is closed
• Improve space usage by making the header bar floating
• Uses Flatpak as packaging format
• Ditched LibUnity in favor of Granite
• Added Portuguese translation - thanks to Henrique Andrade 🎉️ (@henrique-andrade)

Suspend & Resume, AppStream Validation Fix

• Fixed #25: Added hibernation support
• Fixed #20: Avoid time shift if timer does not run
• Fixed #41: Appstream validation failure

Suspend & Resume

• Fixed #25: Added hibernation support
• Fixed #20: Avoid time shift if timer does not run

Dutch translation

• Merged #37: "Dutch translation", thanks to Heimen Stoffels 🎉️ (@Vistaus)

Maintenance Release

• Fixed #26: Play notification sound regardless of "do not disturb" (needs new notification server)
• Fixed #16: Remember window position after close
• Merged #27 & #28: "Turkish translation", thanks to Safak Genisol 🎉️ (@safak45x)
• Fixed #24: Updated AppCenter screenshots to match the Publishing Requirements

Arrow dragging & French translations

• Fixed #19: "Grab arrow after first drag is sometimes difficult"
• Merged #23 "Add French translations", thanks to @NathanBnm 🎉️

Fixed Dependency Issue

Added libunity-dev to debian control file.