Grasshopper_Toolkit: allow a two-way resolution for Geometry display

Following https://github.com/BHoM/BHoM_Engine/issues/960#issuecomment-493982323, and the recent formalisation of physical and analytical objects.

The idea is to have two levels of resolution for Geometry display: physical and analytical.
e.g. when displaying a `Bar` we can either render the actual meshed cross section, or we can render the analytical centerline of the bar. We should allow both.

Three ways:
- Having a component that can be dropped on the canvas, that switches between one viz to another with a toggle
- Having an additional dropdown in the Grasshopper menu that allows us to switch between them
- Adding an option to the right click menu of each component. This would be done at the component level rather than the overall solution level