(3315662d5) Implement optional required items (lol) and fix the doors. It's a bit confusing, but should work.

Barotrauma/BarotraumaShared/Source/Items/RelatedItem.cs

@@ -16,6 +16,8 @@ namespace Barotrauma
             Container
         }
 
+        public bool IsOptional { get; set; }
+
         private string[] identifiers;
 
         private string[] excludedIdentifiers;
@@ -138,7 +140,8 @@ namespace Barotrauma
         {
             element.Add(
                 new XAttribute("identifiers", JoinedIdentifiers),
-                new XAttribute("type", type.ToString()));
+                new XAttribute("type", type.ToString()),
+                new XAttribute("optional", IsOptional));
 
             if (excludedIdentifiers.Length > 0)
             {
@@ -218,7 +221,8 @@ namespace Barotrauma
                 if (subElement.Name.ToString().ToLowerInvariant() != "statuseffect") continue;
                 ri.statusEffects.Add(StatusEffect.Load(subElement, parentDebugName));
             }
-            
+
+            ri.IsOptional = element.GetAttributeBool("optional", false);
             return ri;
         }
     }