How do I generate `setX` methods for all private mutable variables in my class? Do I need to use `__traits`?

I need this for my [tiny-svg](https://github.com/rillki/tiny-svg) project to generate `setX` methods for all Shapes.

Example:
```D
class Rectangle {
    private immutable ...;
    private Color fillColor;
    private Color strokeColor;
    private uint strokeWidth;

    this(int x, int y) {...}

    mixin(???);

    // I need this:
    Rectangle setFillColor(Color color) {...}
    Rectangle setStrokeColor(Color color) {...}
    Rectangle setStrokeWidth(uint color) {...}
}
```

Usage:
```D
new Rectangle(10, 10)
    .setFillColor(Colors.white)
    .setStrokeColor(Colors.black)
    .setStrokeWidth(3);
```

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