[Release] VFRnav 4.25

Hello everyone,

I tried the audible traffic warning yesterday and it works really well, maybe a little too well. While I was standing on the apron the system kept talking to me the whole time, because other aircraft next to me were powering up, landing, or taking off.

Could we perhaps add a configurable speed threshold for this feature, similar to the flight time logging, that determines when the feature becomes active? Anyone who still wants to hear the messages while stationary or taxiing on the apron could then set the value to 0 or something slightly higher.