Mouse Control: Add a tick to allow inverting Y

[thibaudtourneur]

Hello,
How about adding a tick option to allow inverting Y?

Rationale example : Personaly, I'm cabled to push to look down due to the habit of playing flying simulations and it gives me a headache to do otherwise. I always end up killed as I look up in the sky like a dumb instead of looking down where I go or where my ennemy is.

Thanks. Community: would you like such a feature? Feel free to thumb it up.