Allow players to set temporary invite-only option on public puzzles

[jkenlooper]

Players that have done the majority of pieces on a public puzzle should have more control over it. A player that has done the most pieces recently on a puzzle can claim to be the temporary owner of that puzzle. This claim will then allow that player to change the puzzle to be invite only. Any players that would like to join that puzzle would then need to send a request to be invited in by the temporary owner.

The temporary claim will expire after 30 hours. The player may renew their claim 6 hours before it expires if they still have done the majority of recent piece joins on the puzzle.

The temporary owner can kick out players that have been invited in at any time.

A label or icon of sorts should show puzzles that are invite-only and have a temporary owner.

#17 should be done first.