typing-extensions is official python package for supporting typing features on older versions.
It was kind of included in both blenderbim and to ifcopenshell as typing-extensions is also numpy dependency, included it explicitly just in case.
https://i.imgur.com/tqwRSYs.png
Ping @theoryshaw just in case, I can image Ryan finding lots of edge cases in v0.8.0 and this can help narrow them down😁
Solving an issue in 355cca3 I've noticed that because of some unhandled exception iterator was freezing and hanging indefinitely, this should be resolved now to be safe.
Also added had_errors_during_initialization() method that can help identify whether there were errors either during iterator initialization or processing elements.
1) Previously create_shape (was failing with "RuntimeError: Unexpected topology") or iterator (was hanging indefinetely trying initialize with a IfcSlab from #4898) were breaking if element had a material that had IfcSurfaceStyle with just IfcExternallyDefinedSurfaceStyle and no IfcSurfaceStyleShading.
Now get_surface_style is returning IfcSurfaceStyle as first element of the pair even if there was no IfcSurfaceStyleShading - so it can be used to create a `taxonomy::style::ptr` with it to indicate that geometry is still referring to some style.
2) Added logs for unsupported presentation styles (non-IfcSurfaceStyles) to both `mapping::map_impl(const IfcSchema::IfcStyledItem* inst)` and `mapping::map_impl(const IfcSchema::IfcMaterial* material)`. Also `map_impl` will not break now if it will meet IfcCurveStyle.
Example - https://imgur.com/a/NXr6Ku2
Which is especially important for non-IfcMaterials as they currently don't have their own editing UI (besides when they are applied to some element).
Example - https://imgur.com/a/KN8mQPL
Also added some description to material operators (https://imgur.com/a/eIVNEdU). Need to somehow emphasize that this UI is only for IfcMaterials and cannot be used to assign existing layer sets, profile sets, etc...
Andrej730
