Basic camera clamping fix

[RedRoryOTheGlen]

Swaps and reverses the signs of the min and max pitch values when clamping the lookTarget vector in PlayerMouseLook.

Following up from my testing of PR #2704, I figured that the issue was stemming from vectors and angles treating signed values differently. When used in angles, a positive value limits how far you can look down and vice versa for negative values. In vectors, a positive Y-value rotates the vector to point upwards.

At first, I commented out the line clamping the vector in Update and the individual clamping values started working. On the other hand, the unclamped vector caused the player's camera to get stuck if the target vector's pitch was beyond the min/max bounds.

I then decided to just reverse the signs and swap pitch values on the vector clamping and it worked. I then tested it with the vanilla attack control scheme and some mods.

To illustrate: Video of Enhanced Riding from Roleplay & Realism by @ajrb.
In the above video Enhanced Riding limits how far the player can look down, but the current release causes both up/down to be limited. With this fix, the player can now look up freely while being limited when looking down.

I also tested it with Free Rein and Auto-Sight and they also worked just as well, so in addition to fixing the clamping, the original usage of the SetFacing methods is preserved.

[ajrb]

I hadn't realised the look down clamping was also limiting looking up. Glad to see a fix for that.

[KABoissonneault]

Code looks good. Gonna wait for playtest feedback before merging