Import new flight without having to reimport traffic#1048

Make it able to import the next leg of a flight without having to “esc” to the main screen and reinitialize a flight, also causing traffic to dispawn and then reload everything again just to import the next flight plan

That could be solved if BATC would start injecting traffic as soon as the program itself is started.
Not just when you load simbrief.

Would really like to see traffic once batc is started. And then I can make my flightplan comfortably in my cockpit and see already traffic