Offer user quick restart if settings change

Ever been annoyed by those settings in the menu that require a restart? Well I haven't fixed those. But I have added a little dialog to save you some time! That's almost as good right?

![Restart Now?](http://imgur.com/HQJr5fT.png)

Hit the button and the game will be loading again within a second or two.

Doesn't check for mouse-lock in anticipation of #5597 landing.


```Game.Exit``` now takes an optional Boolean parameter. So it actually reads ```() => Game.Exit(false);``` as far as the compiler is concerned, hence why the shorthand no longer works.