* Add root paths parameter to GetOrCreateFolderHierarchy
Ensures that folders are only created up to the root library paths.
* Create full folder hierarchy when scanning a new folder
During a recursive scan, folders should be created as they are encountered (folders are handled in a single thread). This change applies only during a selective scan. Creates up to the root library folder.
* Create folder hierarchy on new file scan
This should only apply when scanning a specific file, as parent folders should be been created during a recursive scan.
* Fix existing folders with missing parents during scan
e52ac14d56