Proper mirror PR for the disease refactor because I fucked up the first one. (#2026)

* Revert "im a dumbass and didn't see the .rej files Revert "[MIRROR] Disease Refactor" (#2025)"

This reverts commit 44742cb115.

* Delete shuttle_loan.dm.rej

* Delete life.dm.rej

* Update life.dm

* Delete life.dm.rej

* compile

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

@@ -41,6 +41,9 @@
 	user.reagents.add_reagent("antihol", 10)
 	user.reagents.add_reagent("mannitol", 25)
 
-	for(var/datum/disease/D in user.viruses)
+	for(var/thing in user.viruses)
+		var/datum/disease/D = thing
+		if(D.severity == NONTHREAT)
+			continue
 		D.cure()
 	return TRUE