Travel::Status::DE::DeutscheBahn v5.06

Add Travel::Status::DE::HAFAS::Product module to handle line numbers, operators, and similar. This enables proper support for journeys with multiple operators and possibly multiple train/line numbers along the route. It also exposes the line ID.
Journey: Add product accessor
Stop: Add prod_arr, prod_dep accessors
hafas-m: Improve stop list display in journey mode
Fix polyline and platform number support in ÖBB backend (and possibly other non-DB backends)
ÖBB backend: correctly handle polylines and platform numbers
ÖBB backend: Remove redundant train numbers from $journey->name / $journey->line / $product->name
ÖBB backend: update productbits (thanks to Cassidy Dingenskirchen)