TODOs:

- Show satellites status in GPSSatCanvas
- Implement logging of data
- Add the possibility to subscribe/unsubscribe to specific NMEA messages
- Manage file end when conecting with file device
- Check if listeners are destroyed when opening and closing a dialog many times.
- Work out on a newGPSFixEvent when all data of a fix is completed
- Trigger events when fix quality is not good (FIX_QUALITY=0, FIX_DIMENSIONS<3,
  FIX_VALID=V, etc.)
- Change TIME inner type
- Keep an eye on processVTG which still generates NMEAException
- In GPSManager.openGPS() set diferent condition for discriminate between
  serial and file device