Allow conversion of spatial elements to Geometry via BHoMGeometry component

#### Description:
One of my colleagues was just working with BHoM panels and asked me why couldn't we have a direct convert from an IElement to geometry.


As discussed with @IsakNaslundBh, this is a bit against the logic plus dangerous because of the risk of losing all properties etc. etc. But then, I believe this would be a nice bow towards the end user, possibly relatively easy to implement (we have `Geometry` methods in place for preview purposes). Additionally, conversion could record a warning and turn the component orange to inform the user about lost properties.

@rwemay @al-fisher FYI