Add ability to select a BCF file to be loaded

src/ifcblenderexport/blenderbim/__init__.py

@@ -34,6 +34,8 @@ if bpy is not None:
         operator.AssignClass,
         operator.SelectClass,
         operator.SelectType,
+        operator.SelectBcfFile,
+        operator.GetBcfTopics,
         operator.SelectFeaturesDir,
         operator.SelectDiffJsonFile,
         operator.SelectDiffNewFile,
@@ -121,6 +123,7 @@ if bpy is not None:
         ui.BIM_PT_documentation,
         ui.BIM_PT_bim,
         ui.BIM_PT_search,
+        ui.BIM_PT_bcf,
         ui.BIM_PT_owner,
         ui.BIM_PT_context,
         ui.BIM_PT_qa,