feat: Random airfield spawning

src/sim/aircraft.hpp

@@ -17,7 +17,7 @@ public:
 	Aircraft(vec2 position, float direction, float speed)
 		: _position(position), _direction(direction), _speed(speed) {}
 
-	void tick(float timestep, vec2 bounds) override;
+	void tick(float timestep, World *world) override;
 	void draw(Renderer *rend) override;
 };