Color Picker: Create color picker form fields.

This class is meant to create form fields that let the users choose one color from a given list of tones.

The class can either output the color picker fields as a list of radio buttons or as a select field with all color the colors as options.

The color list is defined in class array variable that specifies the color codes and names. Currently the class uses the color names in polish but you may redefine the color list in any idiom.