Save modded save data as .dat for steam cloud saves

[BadMagic100]

Steam cloud saves syncs only *.dat, so modded save data is not transferred. This use case comes up stunningly frequently for Archipelago, I don't know why.

Potential reasons not to do this:

• Not all mod save data may be in userX.modded.json/dat. For example rando saves its static data elsewhere.
• Settings will not transfer between devices without further modifications
• Mods will not transfer between devices

[fifty-six]

I think @SFGrenade had also mentioned this. My main hold up would be that it makes it less obvious that the settings are just json that's meant to be easy for users to edit themselves, even with the settings in-game being in a much better situation than previously. We could maybe save as .day and then symlink a json? Or save as both and take the newer of the two?

[SFGrenade]

a joke i thought about but is also kinda funny would be .json.dat tbh

[BadMagic100]

Imo the average user is probably not editing the json by hand anyway, and devs will try to edit it regardless of the extension. But certainly this rationale is not without holes