Yet another customizable Wire Access Grommet

This is my first project using OpenSCAD based on the work of TheNewHobbyist - for more details see "Customizabe Wire Access Grommet" [https://www.thingiverse.com/thing:273159].

The first figure shows the cable bushing in the center of lid and the second one as far as possible towards the brim.

Special thanks to TheNewHobbist.

#### Changes compared to the orginal

I added quite a lot of more customization for the "grommet" and also for the "lid".

> Parameters for the grommet:
> - The outer diameter for the grommet can be given in steps of 0.1 milimeters.
> - The thickness of the grommet walls can be given in milimeters.
> - The thickness of the grommets plate can be given in milimeters.
> - The depth of the grommet.
> - The size of the brim around the grommet.

> Parameters for the lid:
> - The thickness of the lids plate,
> - the overlapping of the lid into the grommet.
> - the thickness of the lid walls
> - the diameter of the cable bushing
> - the location