void TWorld::ProcessShipSpawn() {
    for (size_t i = 0; i < (size_t)Planets.size(); ++i) {
        TPlanet& planet = Planets[i];
        if (!planet.SpawnQueue.empty()) {
            if (planet.SpawnCounter % 4 == 0) {
                Ships.push_back(planet.SpawnQueue.back());
                planet.SpawnQueue.pop_back();
                planet.SpawnCounter = 0;
            }
            ++planet.SpawnCounter;
        }
    }
}