Tweaks for atmos fire and mob interactions
-Hot air is less lethal
-Fire is more lethal
-Catch on fire when entering a hotspot but fire_stacks given dropped to 0.5 each
-You now light up your environment while on fire
Fixing mobs on fire with luminosity
Admin heal now calls ExtinguishMob() so it updates luminosity properly
Added some lines to simple mobs to stop them from using the on fire system at the moment (Needs sprites!)
Merge pull request #1501 from Ergovisavi/mobsonfire_2

Mobs on Fire - Atmos interaction and Bodytemp Damage tweaks