Epinephrine + epipen (#5444)

* add sprite and basic entity, no reagent or testing

* actually implement epinephrine and add it to the box

* allow creating it

* add it to nanomed

* fig

Content.Server/Chemistry/ReagentEffectConditions/ReagentThreshold.cs

@@ -26,9 +26,6 @@ namespace Content.Server.Chemistry.ReagentEffectConditions
 
         public override bool Condition(ReagentEffectArgs args)
         {
-            if (args.Reagent == null)
-                return false;
-
             if (Reagent == null)
                 Reagent = args.Reagent.ID;