TflSource.fetchItems() now returns one TflStatusFeedItem with an
alerts array instead of separate items per line disruption. Signals
use the highest severity. Alerts sorted by station distance.
Co-authored-by: Ona <no-reply@ona.com>
Rename all references across the codebase: package names,
imports, source IDs, directory names, docs, and configs.
Co-authored-by: Ona <no-reply@ona.com>