Add a game timer

[rayrobdod]

Issue type: feature request

Description:

In order to limit game lengths, add timers to limit player turn lengths

Expected Behavior:

Possible options (numbers subject to balancing):

• A per-turn timer that end a turn after two minutes
• A per-game timer that causes a player to loose if all the time of all their turns combined is more than 15 minutes
• a per-game timer of 10 minutes, but the per-game timer isn't affected until a per-turn timer of one minute expires

Actual Behavior:

Everyone has unlimited time to take actions