[Conf] Pre-game Opt-out period

Concise description:
Specifics/Details:
How this will benefit the site and/or other comments:
EDIT: Suggestion of Boot mechanic removed
- Implement a function which would allow players to drop a game/allow the host to boot a player before the game begins and send it back into signups.
Specifics/Details:
- Once a game reaches capacity, it normally enters the game immediately and turns may be taken. Under this scenario, a 24 hour "confirmation period" would begin instead
- During this time, players will confirm that they are pleased with the game's configuration using a command which would be implemented for this purpose. If they are not, they may drop the game and it will return to the signups page.
- In addition, the host would also have the option to boot a player he/she did not want in the game. The host would also be prompted to give a reason for the boot. If the host mistakenly made the setup wrong, the may also have he option to drop out.
How this will benefit the site and/or other comments:
- Reduce the number of games that have undesirable configurations for players by giving them a second chance to review the setup.
- Reduce the number of C&A reports involving alliances between two friends when someone accidentally stumbles upon their game.
EDIT: Suggestion of Boot mechanic removed