Implement Deconstruct for color structs

E.g. 

```c#
    public static class LChuvColorExtensions
    {
        public static void Deconstruct(this LChuvColor lChuv, out double l, out double c, out double h)
        {
            l = lChuv.L;
            c = lChuv.C;
            h = lChuv.h;
        }
    }
```

Usage:

```c#
    LChuvColor lChuv = GetColor();
    var (l, c, h) = lChuv;
```