Add COOKiES submodule for leaflet GDPR

Thanks for creating this issue @Anybody!

The Starshot initiative plan on using the Leaflet module with tiles from OpenStreetMap and Fastly, so perhaps this issue can be revived?

• Use Geofield and Leaflet modules for maps, to respect user privacy #81
• Make Starshot compliant from day one (GDPR in the EU, etc.) #79

Or do you think https://www.drupal.org/project/eu_cookie_compliance → can more easily be configured for OSM and Fastly?

@roromedia convinced me in Make Starshot compliant from day one (GDPR in the EU, etc.) #79 that pursuing a solution here is the preferred method.

Thanks @ressa! Happy to review MR's here. I personally think COOKiES is the better approach in contrast to EUCC, but decide yourself. Happy to review MR's here and help, if we need a specific integration for leaflet!

Thanks @Anybody! I agree that COOKiES is the better approach. I hope someone eventually can add a patch for this.

✨ Add support for GDPR-friendly openstreetmap.de Needs review was just committed and released in Leaflet More Maps 2.2 → , which makes GDPR-compliance easier for OpenStreetMap, since only openstreetmap.de is contacted, hosted at Hetzner in Germany, as opposed to using the default OSM solution, which contacts openstreetmap.org and fastly.net, both hosted in Canada and USA.