feat: update virtools file importer and exporter

- use panel to organise property group in virtools file importer and exporter.
- move all ballance params and virtools params into ioport_shared module and enable different showcase according to the argument passed to show function presenting whether current window is importer or exporter.
- add multiple type ignore to ignore the error of bpy operator member field type hints.

bbp_ng/PROP_virtools_mesh.py

@@ -25,7 +25,7 @@ class BBP_PG_virtools_mesh(bpy.types.PropertyGroup):
         description = "Lighting mode of the mesh.",
         items = _g_Helper_VXMESH_LITMODE.generate_items(),
         default = _g_Helper_VXMESH_LITMODE.to_selection(RawVirtoolsMesh.cDefaultLitMode)
-    )
+    ) # type: ignore
     
 # Getter Setter