[Ready for review] Adherent are so broken it's unbelievable. (#5145)

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## About The Pull Request

Brings Adherent in line with how they're meant to be.

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## Why It's Good For The Game

They're basically just reskinned humans with some funny abilities atm.

Things this PR DOES NOT FIX.
Adherents are still not classed synthetic. Meaning they still have to
drink. I tried, for hours, to get this fixed but couldn't. So someone
better than me will have to, or it'll have to wait for @silicons famed
organ rework.

Adherents still leave footprints, make footsteps, and are affected by
terrain slowdown. I can't feasibly fix this until @silicons maybe does
his movement backend rework.

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## Changelog

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🆑
add: Added Adherent Crystal tools. 0.2 toolspeed, welder only usable by
adherent
add: Added adherent crystal tool vendor 
add: NO_IGNITE species flag that makes the holding species unable to be
set on fire.
tweak: adherent now recieve doubled brute damage
tweak: adherent now recieve 10% of burn damage
tweak: adherent are now immune to radiation and toxin damage
tweak: adherent now have 75 total health
tweak: adherent nutrition use modifier set to 0.04, same as proteans
tweak: adherent now pressure immune
tweak: adherent are unable to be set on fire
tweak: adherent can't eat or drink. (NOTE THIS IS COMMENTED OUT UNTIL
SYNTHETIC CHECKS ARE FIXED)
tweak: adherent spawn with their toolbelt in lieu of a survival kit
/🆑

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code/modules/organs/external/species/adherent.dm

@@ -38,6 +38,7 @@
 	eye_icon_location = 'icons/mob/species/adherent/eyes.dmi'
 	eye_icon = "eyes"
 	robotic = ORGAN_CRYSTAL
+//	can_intake_reagents = FALSE //! DO NOT UNCOMMENT THIS LINE UNTIL ADHERENTS CAN PASS IsSynthetic()
 //	limb_flags = ORGAN_FLAG_CAN_AMPUTATE | ORGAN_FLAG_HEALS_OVERKILL | ORGAN_FLAG_CAN_BREAK
 
 /obj/item/organ/external/arm/crystal