Traverse and update a tree representing the file system
This function takes a tree representing a part of the file system and updates it to reflect the current state of the file system as well as the settings for each node. Children (contained folders) are recursed into if the parents expanded element is set to TRUE, no matter if children are currently present.
traverseDirs(tree, root, restrictions, hidden)
A list representing the tree structure of the file system to traverse. Each element should at least contain the elements 'name' and 'expanded'. The elements 'empty' and 'children' will be created or updates if they exist.
A string with the location of the root folder for the tree
A vector of directories within the root that should be filtered out of the results
A logical value specifying whether hidden folders should be returned or not
A list of the same format as 'tree', but with updated values to reflect the current file system state.