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

Square to round duct adapter. Or round to square duct adapter. Can be parameterized. And it can be used as a funnel.

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### Why
In needed a way to connect a round fan duct to a square duct due to space restrictions behind my laser engraver.

### Design Details
Technically, this isn't a remix because I have written the script from the ground up. But I got inspiration to write it from it.
Intended as a duct adapter from rectangular shapes to round shapes. Can also be used as a funnel but not intended for that. 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. Can be combined with the [Rectangular to rectangular duct adapter](https://www.thingiverse.com/thing:5450522) and the [Round to Round Duct Adapter](https://www.thingiverse.com/thing:6790240).

It is possible to move the rectangular part of the duct in X