Possible improvements

[mgrojo]

• Save board state
• Different themes: Classic colors, Hexadecimal, Stars, etc
• • Roman numerals
• On-screen help
• Undo last move
• Button on screen (for Restart, Undo, etc)
• Fullscreen mode
• Tile animations
• Add to Alire index
• AppImage
• Action for building in GitHub
• Best time
• • Update clock automatically
• Configurable board size
• Localization