Further work on properly integrating, updating and fixing prosthetic options.

WIP
Allowed heads/bodies to be prosthetic. Removed IPC. Refactored some flags.

code/modules/virus2/admin.dm

@@ -87,7 +87,7 @@
 		var/f = 1
 		for(var/k in all_species)
 			var/datum/species/S = all_species[k]
-			if(S.virus_immune)
+			if(S.get_virus_immune())
 				continue
 			if(!f) H += " | "
 			else f = 0

code/modules/virus2/disease2.dm

@@ -45,7 +45,7 @@
 	var/list/res = list()
 	for (var/specie in all_species)
 		var/datum/species/S = all_species[specie]
-		if(!S.virus_immune)
+		if(!S.get_virus_immune())
 			meat += S
 	if(meat.len)
 		var/num = rand(1,meat.len)
@@ -71,7 +71,7 @@
 
 	// Some species are flat out immune to organic viruses.
 	var/mob/living/carbon/human/H = mob
-	if(istype(H) && H.species.virus_immune)
+	if(istype(H) && H.species.get_virus_immune(H))
 		cure(mob)
 		return
 

code/modules/virus2/helpers.dm

@@ -4,7 +4,7 @@ proc/infection_check(var/mob/living/carbon/M, var/vector = "Airborne")
 		return 0
 
 	var/mob/living/carbon/human/H = M
-	if(istype(H) && H.species.virus_immune)
+	if(istype(H) && H.species.get_virus_immune(H))
 		return 0
 
 	var/protection = M.getarmor(null, "bio")	//gets the full body bio armour value, weighted by body part coverage.

code/modules/virus2/items_devices.dm

@@ -16,7 +16,7 @@
 	var/mob/living/carbon/C = M
 	if (istype(C,/mob/living/carbon/human/))
 		var/mob/living/carbon/human/H = C
-		if(H.species.flags & NO_BLOOD)
+		if(!H.should_have_organ("heart"))
 			report("Scan aborted: The target does not have blood.", user)
 			return