Function invert

invert(
pt: Geometry.Point | Geometry.Point3d,
what?: "x" | "y" | "z" | "both",
): Geometry.Point
Inverts one or more axis of a point
```
invert({x:10, y:10}); // Yields: {x:-10, y:-10}
invert({x:10, y:10}, `x`); // Yields: {x:-10, y:10}
```
Parameters
- pt: Geometry.Point | Geometry.Point3d
  Point to invert
- what: "x" | "y" | "z" | "both" = ...
  Which axis. If unspecified, both axies are inverted
Returns Geometry.Point