- Add additional can_atmos_pass value ATMOS_PASS_PROC which indicates custom behavior requiring calling the CanZASPass proc.
- The benefit being for the other three values we DON'T need to call CanZASPass at all! We already know the behavior without the overhead of a proc call.
- Obviously any atom with can_atmos_pass = ATMOS_PASS_PROC cannot now call ..() in CanZASPass() since the default behavior would be to (recursively) call CanZASPass()
- This required re-numbering the constants, so I also fixed all code that assumed particular values for the constants.
- Switched all types which overrode CanZASPass with custom logic to be can_atmos_pass = ATMOS_PASS_PROC
- Changed /turf/c_airblock() to skip calling /atom/movable/c_airblock() for the three can_atmos_pass values that don't require calling the proc.
* Creates the SSair subsystem which replaces the Setup, Start(), and Tick() procs of air_master.
* It may be best to have SSair completely replace air_master, but for now we are having them work together. It does completely replace the old processScheduer air ticker however.
* Remove the obsolete Setup and Tick procs.
* Adjust admin and debug verbs that dealt with some ZAS internals to work with the new implementation.
