Start changing to ynl
Begin TDD simplification
Tidy up after registration test
Switch spec -> test; mini plugin
Separate out old files from the new versions
Add rubocop config to skip some forgivable checks
Implement basic tree for files
Stub out some features for local album detection
Make FileNodes use Pathnames for labels
Restrict rubocop task to relevant files
Implement abstract file tree album finder
Reimplement item as a minimal nested hash with sanity
Guard against setting the empty key
Implement subtree removal by label
Implement album tree -> item converter
Fix item equality
Polish the LAS interface
Define equality on nodes
Implement & test file scanning
Fix problem with array values in items