Funnel Customizer

<h3>This is a customizer to generate funnels parametrically.</h3>

Version 8.6 available.
Now the funnels can have an offset and/or angled spout for hard to reach filling jobs.
Although it is a remix (thanks Salvador Richter), it expands the original project substantially.

To all those who send me $ tips: thank you so much!
It's really rewarding to know that my work is useful to you and appreciated.

Customize the funnel with the following parameters:

***Size and shape***
- **diameters**: external diameters at three locations (top, middle, bottom);
- overall **height**;
- **wall** thickness;
- **neck ratio**: the higher the parameter the longer the "neck" of the funnel. At 1, the neck is one half the overall length, at 3 the neck is 5/6 of the overall length;
- **squish ratio**: sometimes you need funnel with a "squished" elliptical section. (if >1, the "diameters" are the major axes of the ellipse);
- **offset spout**: moves the spout from the center to the edge of the funnel.
- **angled spout**: angles the spout away from the handle for hard to reach filling holes (automatically creates an offset spout);

***Optional features***
- **handle length**: generates a handle if this parameter is not zero, the larger the parameter, the longer the vertical portion of the handle;
- **handle overhang**: if a handle is generated, the larger the overhang, the longer the horizontal portion of the handle;
- **handle angular position**: useful for offset…