Add player save data to Player page for admins

[mordent-goonstation]

Let us see what data a player has in their cloudsave, for a combination of administrative reasons and debugging reasons.

Obvious additional layer:

Let us see what data a player has in their server-specific saves.

The save data would probably easiest best presented as a serialized JSON string, with some optional pretty-printing.

[ZeWaka]

Bonus points to set it