Final API11 updates and new channel switcher

ChatTwo/GameFunctions/Types/TellTarget.cs

@@ -14,4 +14,9 @@ internal sealed class TellTarget
         ContentId = contentId;
         Reason = reason;
     }
+
+    public bool IsSet() => Name.Length > 0 && World > 0;
+
+    public string ToWorldString() => Sheets.WorldSheet.TryGetRow(World, out var worldRow) ? worldRow.Name.ExtractText() : string.Empty;
+    public string ToTargetString() => $"{Name}@{ToWorldString()}";
 }