FOV modification at runtime

[subsoap]

In FPS games it is often the case where you may want to change the FOV while playing. Such as with zoom features, or for making the camera feel more physical. In racing games for example the faster you drive the lower the FOV becomes typically to increase the sense of speed.

So an easy builtin way to set or modify the builtin FOV is needed. With the auto FOV option it probably needs a way to apply a modifier on top per camera?

[rgrams]

This might be an easy tweak, I'll take a look. Right now the FOV is only used on init and afterwards it auto-updates based on the scale mode settings.