Use new met.no locationforecast 2.0 APIHEADmaster

The old XML API will be discontinued next month and is already returning
errors occasionally (apparently to nudge lazy devs like me to update their
code :D).

We're also doing a much better job at caching now, as suggested by the API
documentation.

We're not yet showing a weather icon, I still have to figure out how to do
this now (apparently the weather icons are a separate API / actually just a
tag.gz archive that the weather API references?), but at least we're not
panic()ing any more in the request handlers due to the unexpected error
responses :/.

See https://developer.yr.no/doc/GettingStarted/ for an intorduction to the
new API.

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