Save & restore

[benknoble]

This probably covers a wide range of possibilities:

• saving and restoring player information (like names and HP, or classes if those ever get added)
• saving and restoring state in the middle of a scenario
• ???

My personal preference is to let you choose the files location rather than doing something magical (read: hidden, possibly hard to find/port between machines) like preferences, but we may need preferences for other features anyway.

[benknoble]

More on preferences:

• Preferences
• Using prefs: https://github.com/alex-hhh/ActivityLog2/blob/master/pkgs/the-application/main.rkt
• More sophisticated? https://docs.racket-lang.org/framework/Preferences.html