feat: Random airfield spawning

src/sim/af_spawner.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <vector>
+
+#include "../math.hpp"
+#include "world_object.hpp"
+#include "airfield.hpp"
+
+namespace dxd::sim
+{
+
+class AFSpawner : public WorldObject
+{
+private:
+	std::vector<Airfield*> _airfields;
+	int _cur_tick;
+	int _next_spawn;
+
+public:
+	AFSpawner()
+	{
+		_airfields = std::vector<Airfield*>();
+		_cur_tick = _next_spawn = 0;
+	}
+
+	void tick(float timestep, World *world) override;
+	void draw(Renderer *rend) override {}
+};
+
+} // namespace dxd::sim