Use Leaflet GDPR conform

Great discussion here, many good points!

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

I just created ✨ Add support for GDPR-friendly openstreetmap.de Needs review , which could be relevant for followers of this issue.

We're happy to support this development at COOKiES! Busy times on our side currently, but we'll do what we can. :)