Clear available players after a game takes place

[jonahroth]

It would be good if people had to mark themselves as active each day to be included in the game that day, making playing a game opt-in rather than opt-out. That could take the form of a "clear players" button that we click after each game.

[Serneum]

A clear button should now exist. It would be nice if there was some process that cleared the players every night