Allow to set default hue

If color you choose have Saturation=0 or Lightness=0 (such as `#ffffff`), picker defaults to Hue=0 (red). It would be useful to allow to provide default hue in cases where one color is preferred.

Example:
You have multiple pickers next to each other that defines UI color schema. Some colors have no saturation nor lightness. This causes color picker to be red. If all other colors are greenish, it looks visually unpleasant and can confuse an user.