[App] Better suppression of false lightning reports

I would like an option to be able the suppress false lightnings. I mentioned it before but since we are now voting I mention it again. The idea is to not report a lightning unless it is followed or preceded by another detection within 15 minutes. With a real thunderstorm this isn’t a problem as the lightning is soon followed by another strike, so it will be reported, just with a little delay, and only the first strike of the storm would be delayed a bit, the rest is reported as usual.
It is an option, so people without false lightnings are not effected, but people with these kind of false lightnings finally will get a usable warning system.