Refactors virus spreading

code/game/gamemodes/changeling/powers/panacea.dm

@@ -43,7 +43,7 @@
 
 	for(var/thing in user.viruses)
 		var/datum/disease/D = thing
-		if(D.severity == NONTHREAT)
+		if(D.severity == VIRUS_SEVERITY_POSITIVE)
 			continue
 		D.cure()
 	return TRUE

code/game/gamemodes/miniantags/revenant/revenant_blight.dm

@@ -2,7 +2,7 @@
 	name = "Unnatural Wasting"
 	max_stages = 5
 	stage_prob = 10
-	spread_flags = NON_CONTAGIOUS
+	spread_flags = VIRUS_SPREAD_NON_CONTAGIOUS
 	cure_text = "Holy water or extensive rest."
 	spread_text = "A burst of unholy energy"
 	cures = list("holywater")
@@ -11,7 +11,7 @@
 	viable_mobtypes = list(/mob/living/carbon/human)
 	disease_flags = CURABLE
 	permeability_mod = 1
-	severity = BIOHAZARD
+	severity = VIRUS_SEVERITY_HARMFUL
 	var/stagedamage = 0 //Highest stage reached.
 	var/finalstage = 0 //Because we're spawning off the cure in the final stage, we need to check if we've done the final stage's effects.