fix: Prevent crash on free when RBS is not last node#600
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NOTIFICATION_PREDELETEruns in reverse order, so if RBS is located in the scene tree before any rollback-managed node, RBS will try to deregister a node that has been already freed.The solution was to deregister nodes in
_exit_tree(), if the synchronizer's root node is queued for deletion.Fixes #595