Release: Yoghurt Misery

- Properties_editor

  - conflated the update_rows () with update_rows_w_data (or something)
  
    meaning now the node tree gets rebuilt on every event, such as
    node expansion, new object, etc
    
      since the tree gets rebuilt, we can now store the last one, and
      compare it with the new one to find out what changes has happened,
      enabling us to keep unaffected nodes expanded
      
- Scene_data_node

  - now has a compare_node_values method and submethod enabling the
    enabling the above