Replace "fast forward time control" with 5x time multiplier

Hi,

I think the fast forward time control is useless. Permission for night flights can be get very early in the game, so this button will get useless very soon, especially because it can only be triggered when no aircraft is moving (which is not possible with more than 3-5 stands).

Assuming that nobody creates an airport without night flights, I suggest that it’s replaced with e.g. 5x time multiplier or even faster, comparable to the multiplier of the fast forward mode.

Regards