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>
- Better mapping support (mapping icons and can now set mixer concentration)
- Trimmed overlay lists
- Utilized existing procs for icon generation
- Changed filter icon color to better contrast the output color
