feat: Random airfield spawning

src/sim/world_object.hpp

@@ -2,16 +2,19 @@
 
 #include "../math.hpp"
 #include "../renderer.hpp"
+#include "world.hpp"
 
 namespace dxd::sim
 {
 
+class World;
+
 class WorldObject
 {
 public:
 	WorldObject() {}
 
-	virtual void tick(float timestep, vec2 bounds) = 0;
+	virtual void tick(float timestep, World *world) = 0;
 	virtual void draw(Renderer *rend) = 0;
 };