Structure_Engine: Standardise Geometry3D methods for PadFoundation and PileFoundation

#### Description:

The `Pile` method is very similar to the Bar, so it could be done using an `IElement1D` as an input (require versioning) and potentially a dynamic cast to avoid any unsupported `IElement1D` objects.

The `Pad` is similar to `Panel` but varies in that it starts from the top of the pad instead of the centre.

The `Panel` method does not support walls as offsets are vertical instead of to the `Plane` normal.