Compute wall net quantities (IfcOpenShell#2086)

* Compute wall net quantities

* Remove opening check clause

Create section and elevation contexts on new projects. See IfcOpenShe…

…ll#1153.

Fix bug where timeline date didn't update during animations

Very minimal implementation of generating parametric duct segments fr…

…om duct size properties

Be more forgiving to invalid Revit IFCs when importing.

Texture support is now compatible with glTF texture maps

UV coordinates for triangulated face sets are now saved in IFC.

Fix bug where false geolocation offsets did not take into account rot…

…ation.

Target view is now read from IFC. See IfcOpenShell#1153.

You can now connect, disconnect, and set flow directions of distribut…

…ion ports in Blender.