HSV ColorPicker / Color wheel

An extension to the ColorPicker control which adds an HSV-based color wheel. A button scene, similar to ColorPickerButton, is also included.

Update 1.22 (2 Oct 2018):
* ClassicControls color preview sliders now update their gradients when color is changed externally

Update 1.21 (21 Sep 2018):
* Bugfix: Color property not updating on PickerPanel under certain conditions

Update 1.2 (19 Sep 2018):
* Bugfixes to PickerPanel affecting editor persistence and signalling

Update 1.1 (19 Sep 2018):
* Neat hack to show custom editor icons for each control type
* Flat mode for PickerPanel

Update 1.0 (18 Sep 2018):
* Colored slider bars are back! ClassicControls no longer hijack input when clicking in the area above the control.
* A combined picker tool is now offered.
* HuePicker now has a preview swatch that can be clicked to bring up a standard ColorPicker.