Use in over ref modifier in Math functions input parameters

Source/Engine/Core/Math/Half.cs

@@ -213,7 +213,7 @@ namespace FlaxEngine
         /// <param name = "value1" />
         /// <param name = "value2" />
         /// <returns><c>true</c> if <paramref name = "value1" /> is the same instance as <paramref name = "value2" /> or  if both are <c>null</c> references or if <c>value1.Equals(value2)</c> returns <c>true</c>; otherwise, <c>false</c>.</returns>
-        public static bool Equals(ref Half value1, ref Half value2)
+        public static bool Equals(in Half value1, in Half value2)
         {
             return value1.rawValue == value2.rawValue;
         }