More appropriate color picker

[jleibs]

Our default color-picker dedicates a lot of space to saturation and brightness, but very little space to choosing Hue:

However, it's likely users want to quickly pick a visually distinct value without needing to adjust hue and then pick a saturation/brightness.

Other picker designs such as:

or

seem like they might be a better fit.

[achary]

I would add that the current color picker allows to copy the currently selected color to the clipboard, but then, it's impossible to paste it (e.g. in a color picker for an another component).
The copied color value seem to be rr, gg, bb numbers in decimal form. This is rather unique and unusual, at least compared to what a great number of graphical apps use.

I would suggest:

• changing the color format used for clipboard to #RRGGBB (values in hex).
• introducing an extra #RRGGBB text edit field where copied color value can be pasted.

The existing R, G, B field with editors could stay, but I would imagine them being a rather second-class citizen on a color picker.