Add support for NN startNavigationSession/stopNavigationSession methods

[kried]

Description

Closes NAVIOS-983

Implemented logic:

• iOS SDK calls startNavigationSession if the session was not started yet, and either an instance of PassiveLocationManager is created (free drive) or the callback of Navigator.setRoutesData was called (active guidance)
• it calls stopNavigationSession when no more session running (could be deinitialization of PassiveLocationManager or Navigator.setRoutesData(null))
• it calls storeNavigationSession before switching to offline or switching back to online. And SDK calls restoreNavigationSessionForState when switching finished