No Fly Zone Diplomatic relation (and Intercepting)

No Fly-Zone

So most players get really annoyed when someone immediately sends intercepters over your land on scouting missions, this new feature aims to stop this.

Option 1. You declare a no-fly zone over your own country, or over that of an allies country, and if a player sends aircraft into that nation's airspace then they automatically declare war on you.

Option 2. You still have to declare a no-fly zone, but instead of automatically declaring war, one of your interceptors will intercept the plane, and escort it back to that nation's airspace.

Intercepting and escorts

a new feature on interceptors, when clicked you then click on the aircraft you want to intercept and it will fly to that aircraft and remove it from your airspace without there being a fight.

Feel free to add, or criticize.