[🚀] Export/Import for settings and progress

[bkimminich]

🚀 Feature request

Description

It would be nice to have the chance to save

• hacking progress (continueCode cookie)
• local settings
  • cookies language, cookieconsent_status and welcomebanner_status
  • local storage displayedChallengeCategories, showOnlyTutorialChallenges, showDisabledChallenges and displayedDifficulties

in a local file and restore from that file later on the same or a different computer.

Solution ideas

The settings/progress could be saved in a JSON object and then exported via JSON.stringify into https://www.npmjs.com/package/file-saver. Restore mechanism could be a lonal-only file upload parsing the JSON string and populating the corresponding items in cookies and local storage.

Possible alternatives

Some kind of sophisticated cloud storage and syncing like IntelliJ... 🤣

[bkimminich]

Preliminary save/restore: 00a8573

[bkimminich]

Save and Restore is implemented, I need to add some tests and also allow the whole feature to be turned off (e.g. by default in CTF mode) because it's just too convenient to cheat with this.

[github-actions]

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