With 4 float arguments, the currently selected preset is set to a custom color defined by the four arguments (in RGBA format).
With 1 integer followed by 4 float arguments, the preset number defined by first argument is set to a custom color defined by the four arguments (in RGBA format).
The integer argument, between 1 and 6, defines which color in being modifier, and next the four floats define the color in the RGBA format.
With no argument, it resets colors for the select preset to default values.
