Cleanup.
Add tests for conversion extensions.
Rename Unwrap.
Rename UnwrapToSIUnit. Globally convert SIUnits to numbers in eval.
Return lengths where applicable.
Convert units coming out of revit nodes to SI.
Avoid a name collision with solid volume.
Rename LibG surface area to avoid name clash.
Add host application conversion to units. Refactor ToString on units.
Add ceiling, floor, and round for units. Do not unwrap units going into math operations.
Handle host unit conversion of lists.
Cleanup RevolveSolid test layout.