#193 Properly support undo/redo when adding/removing measurement lane plots
The majority of the diff is caused by rename+move of existing methods (added _
to the methods only used internally).
Changed:
Previously on_lane_selection_change
did both the insert/delete of entity and propagate changes to UI components, not it does only the insert/delete and UI changes follow measurement_lane_added/measurement_lane_deleted events.
Edited by Jaak Kütt