tour automatically begins and ends

[stefanwerfling]

The tour automatically begins and ends when the distance to the port is greater or less than a limit.

[stefanwerfling]

Note:

• https://stackoverflow.com/questions/61943711/google-maps-flutter-check-if-a-point-inside-a-polygon
• http://geojson.io/#new&map=16.48/28.080238/-17.331668