Spatial_Engine: IsVertical methods

[rwemay]

Description:

Add is vertical methods for Element1D and possibly Element2D(?) Checking whether a line or a planar surface based object is vertical is something that recurs in many disciplines, and there are already some methods (e.g. structural bar). Could also come in handy for the 'tilt' methods below. #1197

To be merged first: #1316

[pawelbaran]

Sounds good - changed the header to Common_Engine as it should work on IElements I think.

[FraserGreenroyd]

@pawelbaran @LMarkowski is this likely to be actioned next week? If not we should push this to 3.1?

Also is Common_Engine the right engine to place this, I thought all common engine methods were migrating out?

[pawelbaran]

Yeah, IElements are meant to migrate to the Geometry universe altogether - #1316 should go first I think. I will update the Milestone and title.

[kThorsager]

Can note that this is partly handled in #1402 by moving some functionality from Structure_Engine to Geometry. Will however not fix IElement things before #1316

[pawelbaran]

@kThorsager is that issue still relevant?

[kThorsager]

I haven't fixed it, so would suppose so.

But IElement solutions should be in Spatial_Engine, but unsure if methods for IGeometries are requested too