Full support for extended GTFS transport modes #45
Description
Description
Extended GTFS transport modes (see https://opentransportdata.swiss/en/cookbook/masterdata-cookbook/transport-modes/) are not saved in the timetable and replaced by standard GTFS modes during parsing. They should be loaded as well and returned with the final routes. It should also be possible to constraint routing based on extended transport modes in addition to standard GTFS modes.