mirror3dFunction in std::transform

Create a mirror image of a 3D solid/surface/body, across some specified mirror axis.

Name	Type	Description	Required
`bodies`	[`Solid`; 1+]	The body or bodies to be reflected.	Yes
`across`	`Edge` or `Plane` or `Axis3d` or `Segment` or `any`	The axis (or other geometry) to reflect across. An edge specifier object such as `{ sideFaces = [faceTag1, faceTag2] }` can identify a solid edge without using its UUID.	Yes