A variety of FoV related discrepancies

[littlebabyman]

Scoped in, the viewmodel FoV is all over the place, expecting 16:9.

Crosshair scales incorrectly with screen width, rather than the FoV.

Viewmodel FoV also should be based on vertical FoV for consistency's sake, also seen above, and likely also relating to the first issue.

It also causes the muzzle effects to appear too far into or out of the weapon.

[Fesiug]

Fixed!