feat(Cast): make drag curve offset a vector3

The Drag Curve Offset is now a Vector3 allowing the curve offset to
be applied to any axis rather than just the back axis.

To replicate the orignal setting, just change the Z axis to a negative
value and this will replicate the same as the Vector3.back * offset.

Runtime/Cast/StraightLineCast.cs

@@ -111,13 +111,13 @@ public int DragEffectDensity
                 }
             }
         }
-        [Tooltip("The amount of height offset to apply to the curved drag line.")]
+        [Tooltip("The amount of offset to apply to the curved drag line.")]
         [SerializeField]
-        private float dragCurveOffset;
+        private Vector3 dragCurveOffset;
         /// <summary>
-        /// The amount of height offset to apply to the curved drag line.
+        /// The amount of offset to apply to the curved drag line.
         /// </summary>
-        public float DragCurveOffset
+        public Vector3 DragCurveOffset
         {
             get
             {
@@ -321,7 +321,7 @@ protected virtual void GeneratePoints(Vector3 originPoint, Vector3 midPoint, Vec
         {
             curvePoints.Clear();
             curvePoints.Add(originPoint);
-            curvePoints.Add(midPoint + (Vector3.back * DragCurveOffset));
+            curvePoints.Add(midPoint + DragCurveOffset);
             curvePoints.Add(destinationPoint);
             curvePoints.Add(destinationPoint);