Star thickness

[amousavi]

Hello,

In this branch is a configurable attribute to give the star some "thickness" to match a growing trend of star styles. A float value from 0 to 1 will push the inner vertices outwards, giving the star some "thickness".

0 will mean no changes, and will be set by default if no attribute srb_starShapeThickness is set. 1 is the maximum amount of "thickness", and will result in a pentagon.