Adds a new game option: slow_game_type_odds

If it's on on the server revision screen below the preexisting information there will be a readout showing the raw chance of each round type occuring. This doesn't tell anyone what the current round type is, it just shows what the odds are.

It defaults to off
Merge pull request #2652 from Incoming5643/showodds

Adds a new game option: show_game_type_odds