pausing game does not pause autosave timer

[hvds]

I went for a smoke, and came back to find the log full of once-a-minute "Game saved!" messages. I don't think it should save if the game has continually been paused since the last save; if the easiest way to achieve something close to that is to pause the autosave timer, that would also work fine for me.

(This was also mentioned in passing in #128.)