Hide any departures that will leave within x mins

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This is a request that @kitpaddle has requested.

I know from my apartment, even at my fastest run I can't reach my closest station in less than 4 mins. I was wondering if there could be a parameter that therefore hides any trains/buses that have a time less than 4 mins as they are not relevant for my planning if you understand what I mean. So maybe a time parameter (minutes or seconds) that if other than 0 hides items with a time to departure less than itself?

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Closing this with the commits on the 10th May -20