Species Damage Modifiers Affect Targeted External Organ Damage

Created by: Shadowmech88

/datum/organ/external/proc/take_damage() now takes the burn_mod and brute_mod of the organ's owner's species into account when applying damage. The most obvious effect of this is that now diona will take increased burn damage from electrical shocks according to their burn_mod, and golems will take decreased burn damage from electrical shocks according to their burn_mod.

Fixes #9533 (closed).