Refactored so that all functions in exporter place in distinct collections - no more MyScene property
Exporter now populates a SceneInformation object with names of top level objects
When exporting tree from one node is enumerated down into collections mentioned above (no more 'addednodes' property, or finding props in addFigure - the entire tree is treated as a single asset now)
User can now specify which nodes to export via pipe and get updates only for them
User can receive scene info via pipe without sending geometry
(This has not been integrated into GUI yet)