Time commitment for new games

[Thrillberg]

It's been suggested a few times to indicate (in a non-enforced way) the time commitment for a new game. Here are the proposed options:

live, fast async (2+ moves per day), async (1 move per day), slow async (1 move every other day) and infinite (no speed commitment)

We can let the game host indicate which of these they want for their game and also provide an average total game length based on games in our database.

[Thrillberg]

We won't address this now:

provide an average total game length based on games in our database.

But we can do this in a later followup.