Draw stars for polls system: Draw graphical percentage bars made of star icons

This class is meant to generate graphic percentage bars made with start icons.

It can be used to present the results of poll systems on which the generated percentage bars represent relative values of each poll choice.

The class comes in two versions: one for drawing large stars and another for small stars.

Several presentation details may be configured like the star colors the number of starts to present for 100% bars.

The class generates the star bars images in PNG format.