Add Add/Subtract methods to Transform

Source/Engine/Core/Math/Quaternion.cs

@@ -324,6 +324,14 @@ namespace FlaxEngine
             Z = -Z;
         }
 
+        /// <summary>
+        /// Gets the conjugated quaternion.
+        /// </summary>
+        public Quaternion Conjugated()
+        {
+            return new Quaternion(-X, -Y, -Z, W);
+        }
+
         /// <summary>
         /// Conjugates and renormalizes the quaternion.
         /// </summary>