Rectangular to Rectangular duct adapter (parameterized) (CC-BY-SA)

Rectangular To Rectangular Duct Adapter. Could even be a square to square adapter because it can be parameterized.

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### Why
After making the [Round to Rectangular Adapter](https://www.thingiverse.com/thing:6592233), I discovered that I needed a duct adapter with two rectangular ends.

### Design Details
Intended as a duct adapter from rectangular shapes to rectangular shapes. Can be combined with the [Round to Rectangular Adapter](https://www.thingiverse.com/thing:6592233). There are no sanity check in the script. That means, if a shape can be generated, it will be generated. Even if that results in floating surfaces.

It is possible to move both end of the duct in X and Y direction and add flanges for mounting fans to the adapter ends. All can be selected separately. It is also possible to change the render resolution of the part.

OpenSCAD can be found to download at https://openscad.org/

The fu