* The vast majority of gas mixtures never use their `graphic` list. Prime candidate for making a lazy init list.
* While we are here, add nullchecks to ZAS's use of the graphic list a bit. /turf/update_graphics was technically already null safe, but its even better to not bother calling it at all right?
Implements liquid fuel fires using the liquid fuel cleanable decal objects.
Rewrites zburn to be more sane, replaces convoluted calculations with straightforward reaction limit.
Fixes issue with liquid fuel spreading caused by thee object being deleted.
Prevents zones from being repeatedly added to the active fire zones list, and processed repeatedly.
slight visual artifact when zones are rebuilt, overlays will be
missing until the end of the current tick. otherwise works fine.
Signed-off-by: Mloc-Argent <colmohici@gmail.com>
New turf proc: assume_gas(). Maps to air.adjust_gas_temp().
Lots of optimizations to processing, fire, lighting, HasEntered() and
more.
Zones now process all fire data and existance in one go, fire objects
only handle spreading.
Most code has been ported straight so some of it mightn't be ideally
structured for the new gas_mixtures.
Signed-off-by: Mloc-Argent <colmohici@gmail.com>
