Add Wallet settings menu, do not rebase keypaths when create the PSBT

BTCPayServer/Validation/KeyPathValidator.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using NBitcoin;
+
+namespace BTCPayServer.Validation
+{
+    public class KeyPathValidator : ValidationAttribute
+    {
+        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
+        {
+            var str = value as string;
+            if (string.IsNullOrWhiteSpace(str))
+            {
+                return ValidationResult.Success;
+            }
+            if (KeyPath.TryParse(str, out _))
+            {
+                return ValidationResult.Success;
+            }
+            else
+            {
+                return new ValidationResult("Invalid keypath");
+            }
+        }
+    }
+}