deprecate mixing up ifc materials and styles in one blender material on loading #4843

Part of the transition process disconnecting blender materials from IFC materials to make it less confusing.

E.g. previously if we would load an element A with material M and style S it would load it as blender material M that looks like S.
But also if you would load element B with just style S, it would add it as blender material M though B has nothing to do with material M.

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -1614,26 +1614,7 @@ class IfcImporter:
         return blender_material
 
     def create_styles(self) -> None:
-        parsed_styles = set()
-
-        for material_definition_representation in self.file.by_type("IfcMaterialDefinitionRepresentation"):
-            material = material_definition_representation.RepresentedMaterial
-            blender_material = self.material_creator.materials[material.id()]
-            for representation in material_definition_representation.Representations:
-                styles = []
-                for styled_item in representation.Items:
-                    styles.extend(styled_item.Styles)
-                while styles:
-                    style = styles.pop()
-                    if style.is_a("IfcSurfaceStyle"):
-                        self.create_style(style, blender_material)
-                        parsed_styles.add(style.id())
-                    elif style.is_a("IfcPresentationStyleAssignment"):
-                        styles.extend(style.Styles)
-
         for style in self.file.by_type("IfcSurfaceStyle"):
-            if style.id() in parsed_styles:
-                continue
             self.create_style(style)
 
     def create_style(