Parametric radiator foot cover

Remix of [kekecs radiator (pipe) cover](https://www.thingiverse.com/thing:4148151) that can generate a cover for a radiator foot/stand/whatever you call those in English :P
It's fully parametric and can be customized in OpenSCAD or in the customizer.

The only "tricky" parameter is the radius for the rounded corners of the cut-out. ~~Since you probably can't measure it directly some trial and error might be involved.~~ Something like [this](https://www.thingiverse.com/thing:1646307) or [this](https://www.thingiverse.com/thing:1184315) might help with that ;)