weather: Add some heuristics to GetCurrent* #1882
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This means that there is a higher likelihood that the returned event is the most up-to-date current event.
It chooses the event with the lowest expiry, and between events with the same expiry, it chooses the one with the latest timestamp.
Alternative to #1878.
I'm not the best when it comes to working with references to unique_ptrs etc, so if there's a better way to keep track of the best option so far, I'd like to hear it.