Add player profile public toggle

[scottanderson]

Player profile public flag

Players who opt in can show their identity in locations like https://api.openfront.io/leaderboard/public/ffa and on the game summary screens.

Setting the public flag

To set the profile to public send POST /users/@me to https://api.openfront.io with the body: {"public": true}.

Implementation

Add a toggle button to enable or disable the public flag.

May depend on #1728

[LeviathanLevi]

Please assign this issue to me, I'll work on it

[LeviathanLevi]

It seems the dependent work for this issue was closed and not completed. Please un-assign me from this issue for now as I may not have the time in the future to work on it. Thanks