Changelog:

• Workaround for a crash at exit in some situations.
• Dialog for starting rated game was not shown after accepting a dialog to discard current game.
• Avoid deprecated mimetypes tag in AppStream file.
• Avoid warnings with Qt 6 caused by deprecated signal handler syntax.

Depends on D12456

Signed-off-by: Algent Albrahimi <algent@protonmail.com>

• Start game, play, save, open saved game.
• Export as PNG image and TXT with ASCII Arc Option.