We started to move to Open Street Maps (OSM) and one simple change was
to show OSM tiles on top of the current Google Maps functionality. This
hybrid use violates Google's terms and conditions though and I'm
reverting it here (basically reverting daa5b00a2).
Another branch of work was already started to use OSM without Google
functionality and it's available behind a feature toggle. We can
continue that work in our own time without a license violation. This
change is only changing the tiles, the look of the map and doesn't touch
any functionality which was always provided by Google Maps.
The map is displayed using https://leafletjs.com/
To enable Open Street Map go to the Admin -> Configuration -> Content section and click 'Open Street Map Enabled'.
The 'Open Street Map Provider Name' setting can be used to configure different tile providers thanks to the Leaflet-providers extension (https://github.com/leaflet-extras/leaflet-providers)
Some tile providers require an API key, this can provided in JSON format e.g. '{ apiKey: 123 }' in the 'Open Street Map Provider Options' setting.
Each tile provider has their own usage policy so this should be checked before enabling Open Street Map.
The search field for the Open Street Map works differently than searching on Google Maps. It matches producers by their name or address because it was easier to implement instead of matching place names all over the world.
