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* TreeNode objects now have a revision number, incremented each time they are modified, and no longer have a back reference to the reference that "owns" them. * Revision number is captured whenever a node is added to a writer. * TreeNodeRefs clear out the object they're tracking when written, if the revision number hasn't changed, and also no longer have a back reference to the node that "owns" them. * New OnExpand() / OnCollapse() callback methods on TreeNodeRef allow custom behavior when a ref is about to transition state. * See comment above TreeNodeRef for a breakdown of the various states and state transitions for refs. #preflight none [CL 23099350 by Ben Marsh in ue5-main branch]