Inductor_SMD: add Chilisin 7.3x6.6mm power inductors

Sourced from https://www.chilisin.com/upload/media/product/power/file/BMRx_Series.pdf

Tweaked the footprint generator to allow, but not require, specifying the footprint 3d model suffix to use, to make it easier to link to auto generated step files, not just the classic vrml files.

Signed-off-by: Karl Palsson karlp@tweak.net.au

This is the footprint generator used for kicad-footprints!2591 (closed)