start updating script generated Housings_QFN adding STEP and WRL

models are generated by parametric scripts,
STEP file size optimized, WRL with KiCAD suggested
materials

https://github.com/easyw/kicad-3d-models-in-freecad/tree/master/cadquery/FCAD_script_generator

discussion related at

https://forum.kicad.info/t/contributing-to-update-of-vrml-librarys-to-step/5049/

Author: easyw