HUD button for lines/shapes to change the line/fill color (with lib colorpicker)

[apoapostolov]

Changing color of drawings is very annoying as you have to open the settings dialog and dig into the huge amount of settings to find the line and fill colors. Adding buttons on the hud that use the current colors and on click, open colorpicker and allow to change the color without having to mess with settings dialog, would be greatly appreciated.