Parametric Flat Star with optional comet tail (OpenSCAD Customizer)

UPDATE 15-DEC-2019:
- made all star diameters customizable
- added "projection" function for Lasercutter DXF export

UPDATE 19-DEC-2018:
- Bugfix for 2- and 3-stacking level
- added 7th stacking level
- scaled subtraction body by 1.01 to improve visibility in customizer
- made CHAMFER customizable

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UPDATE 16-DEC-2018:
- added 6th stacking level
- added chamfer option
- reduced bar width for even nicer look and less print time