* Port of the "Airflow" portions of Yonaguni/EuropaStation#618
* The "airflow" part of ZAS used to be handled by a sleep'd loop. This has the potential to bunch up and lag. Switching to a StonedMC managed subsystem improves it.
* Fixed to ensure that zshadow mobs cannot be blown around by the wind no matter how fierce.
* Added a message to mobs informing them when their boots save them from being wind-thwapped.
* Check w_class on non-item objects if they have it defined (might as well since var/w_class is on /obj)
* Tiny optimization of c_airblock
Kashargul