Added UniqueId property to ICredential

mRemoteNGTests/Credential/CredentialRecordTests.cs

@@ -15,6 +15,13 @@ namespace mRemoteNGTests.Credential
             _credentialRecord = new CredentialRecord();
         }
 
+        [Test]
+        public void UuidIsUnique()
+        {
+            var credRecord2 = new CredentialRecord();
+            Assert.That(_credentialRecord.UniqueId, Is.Not.EqualTo(credRecord2.UniqueId));
+        }
+
         [Test]
         public void HasUsername()
         {

mRemoteV1/Credential/CredentialRecord.cs

@@ -1,10 +1,13 @@
-using System.Security;
+using System;
+using System.Security;
 
 
 namespace mRemoteNG.Credential
 {
     public class CredentialRecord : ICredential
     {
+        public Guid UniqueId { get; } = Guid.NewGuid();
+
         public string Username { get; set; } = "";
 
         public SecureString Password { get; set; } = new SecureString();

mRemoteV1/Credential/ICredential.cs

@@ -1,10 +1,12 @@
-using System.Security;
+using System;
+using System.Security;
 
 
 namespace mRemoteNG.Credential
 {
     public interface ICredential
     {
+        Guid UniqueId { get; }
         string Username { get; set; }
         SecureString Password { get; set; }
         string Domain { get; set; }