* Rewrite basic path logic to be simpler
Make basic path logic deal only with path elements instead of elements
and segments. Upper-layer logic can deal with elements.
Base path logic does not require a complete resource path as would be
seen by kopia, it just manages splitting/joining/escaping path elements.
Will have transformers to go from a basic path to a resource specific
path in a follow up.
Remove upper-layer logic for now to reduce load while reviewing as it
also changed slightly. Will be re-added in a follow up
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