Streetcomplete: Make getting the country for GPS pos more performant

[westnordost]

Getting a country for a given set of GPS coordinates is quite heavy on the CPU because it's a point-in-polygon-check for quite some big polygons.

[westnordost]

(Would make it possible to make the country-blacklist/whitelist more precise as well)

[rugk]

https://stackoverflow.com/questions/3659809/where-am-i-get-country#19415296

Variant listed there:

• get via SIM (getNetworkCountryIso)
• via IP (as the online service) using an ip database as flagfox

[westnordost]

Where a point is, not where you yourself are. Don't worry, I do know exactly what to do.

[westnordost]

Success! (AddMaxSpeed is disabled in US, but not in Mexico)

[westnordost]

Finally got this off my todo list.

In the last 2 weeks, I worked on this: https://github.com/westnordost/countryboundaries

[rugk]

Awesome! 🎉