Implemented FPTF type Line and Operator.

[tiuub]

Hi there,

I have implemented FPTF type Line and Operator, like in the original hafas-client JavaScript client.

FPTF Line type includes (like in hafas-client/parse/line.js):

• id: str,
• fahrtNr: Optional[str] = None
• name: Optional[str] = None
• public: Optional[bool] = True
• adminCode: Optional[str] = None
• productName: Optional[str] = None
• mode: Optional[Mode] = Mode.TRAIN
• product: Optional[str] = None
• operator: Optional[Operator] = None
• addName: Optional[str] = None

FPTF Operator type includes (like in hafas-client/parse/operator.js):

• id: str
• name: Optional[str] = None

Deprecated Leg.name and Leg.mode, which are now referencing to Leg.line.name and Leg.line.mode.