experimental support for spline curves representation #3233

there is still no full support but as a workaround I've added blender converting curves to meshes and back to curves so we could preserve the actual shapes

before - https://i.imgur.com/9F542Iy.png
after - https://i.imgur.com/t58RlkF.png

src/blenderbim/blenderbim/tool/blender.py

@@ -320,6 +320,15 @@ class Blender:
         context.view_layer.objects.active = active_object
         active_object.select_set(True)
 
+    @classmethod
+    def set_objects_selection(cls, context, active_object, selected_objects):
+        for obj in context.selected_objects:
+            obj.select_set(False)
+        for obj in selected_objects:
+            obj.select_set(True)
+        context.view_layer.objects.active = active_object
+        active_object.select_set(True)
+
     @classmethod
     def append_data_block(cls, filepath, data_block_type, name, link=False, relative=False):
         if Path(filepath) == Path(bpy.data.filepath):