*Unbuggered the buggered up code.

I swear, I'll get better at this. It works now.
Merge branch 'master' of https://github.com/sawu-tg/-tg-station
Overhaul of Certain chemical effects to Aliens as well as Alien Damage.

*Alien chemistry now interacts differently with a large amount of chemicals, many of the chemicals still harm or hurt the alien, but nothing provides an instant and surefire way to out alien players as before.

*Damage for aliens has been revised, different castes do different damage, and damage is modified depending on darkness and stance (Maximum damage can be achieved by a queen crouching/prowling in the dark, a 4.5 modifier)

List of Chemical effects (and the thing that does it) to Aliens:

*Slime - Randomised
*Space Lube (Silicon) - Slow
*Dylovene (Silicon/Nitrogen) - Slow/Burn
*Sleep Toxin (Chlorine) - Acid cloud/Paralyze
*Nitrogen (Nitrogen) - Slow Heat
*Chlorine (Chlorine) - Acid Cloud
*Nitroglycerin (Nitrogen) - Slow Heat
*Ryetalyn (Silicon/Nitrogen) - Slow/Burn
*Sterilizine (Silicon/Nitrogen) - Slow/Burn
*Silicon (Silicon) - Slow
*Leporazine (Silicon) - Slow
*Lexorin (Nitrogen) - Burn
*Belotane (Silicon) - Slow
*Dermaline (Silicon) - Slow
*Tricordazine (Silicon/Nitrogen) - Slow/Burn
*Hyronalin (Silicon/Nitrogen) - Slow/Burn
*Alkysine (Chlorine/Silicon/Nitrogen) - Slow/Burn/Paralyze
*Imidazoline (Silicon/Nitrogen) - Slow/Burn
*Mindbreaker (Silicon/Silicon/Nitrogen) - Full Slow/Burn
Merge branch 'xeno-up' of https://github.com/sawu-tg/-tg-station into xeno-up
*Fixed an nondescript variable
*Sentinal modifiers, they're now light fighters like intended.