Add disabling front/latch autoproxy per-member

PluralKit.Core/Models/PKMember.cs

@@ -24,6 +24,7 @@ namespace PluralKit.Core {
         public bool KeepProxy { get; private set; }
         public Instant Created { get; private set; }
         public int MessageCount { get; private set; }
+        public bool AllowAutoproxy { get; private set; }
 
         public PrivacyLevel MemberVisibility { get; private set; }
         public PrivacyLevel DescriptionPrivacy { get; private set; }