rotate scripted optic according to weapon bank

[commy2]

When merged this pull request will:

• title

[PabstMirror]

seems to be a little variance with left and right depending on terrain slope and view direction,
but I'm not sure if it's wrong or that's how it actually is
e.g. left = -31.7463, right = 29.1498
also it seems to handle "bipod deployed" tilt correctly (world tilts, not the gun)

[commy2]

Some dev code to mess around with:

["cba_debug", "onEachFrame", { 
    params ["_unit", "_weapon", "_pos"]; 
    private _aim = _unit modelToWorldVisualWorld (_unit selectionPosition "Pelvis"); 
    private _cam = _unit modelToWorldVisualWorld (_unit selectionPosition "camera"); 
    private _up = _aim vectorFromTo _cam; 
 
    private _wDir = _unit weaponDirection _weapon; 
    private _wLat = vectorNormalized (_wDir vectorCrossProduct _up); 
    private _wUp = _wLat vectorCrossProduct _wDir; 
 
    private _origin = _unit modelToWorldVisualWorld (_unit selectionPosition "proxy:\a3\characters_f\proxies\weapon.001") vectorAdd 
        (_wDir vectorMultiply _pos#0) vectorAdd 
        (_wLat vectorMultiply _pos#1) vectorAdd 
        (_wUp  vectorMultiply _pos#2); 

    private _0 = AGLToASL positionCameraToWorld [0,0,0]; 
    private _x = AGLToASL positionCameraToWorld [1,0,0]; 
    private _y = AGLToASL positionCameraToWorld [0,1,0]; 
 
    private _up = _0 vectorFromTo _y; 
    private _right = _0 vectorFromTo _x; 
 
    drawLine3D [ASLToAGL _origin, ASLToAGL (_origin vectorAdd _up), [1,0,0,1]]; 
    drawLine3D [ASLToAGL _origin, ASLToAGL (_origin vectorAdd _right), [0,1,0,1]]; 
    drawLine3D [ASLToAGL _origin, ASLToAGL (_origin vectorAdd _wUp), [0,0,1,1]]; 
 
    systemChat str round (90 - acos (_right vectorCos _wUp)); 
}, [player, currentWeapon player, [2,0,0]]] call BIS_fnc_addStackedEventHandler; 

seems to be a litter variance with left and right depending on terrain slope and view direction,

Yeah, Pelvis is not the perfect memory point for this, but the best I have. There also is aimPoint, but that has worse results, especially in the side stances.

[commy2]

Deployed on hills sideways.