Clipboard action now sets an expiration timer

WIP Max History count (back-end done, front-end todo)

ModernKeePass.Application/Database/Models/DatabaseVm.cs

@@ -12,5 +12,6 @@
         public string KeyDerivationId { get; set; }
         public int Size { get; internal set; }
         public bool IsDirty { get; internal set; }
+        public int MaxHistoryCount { get; set; }
     }
 }

ModernKeePass.Application/Database/Queries/GetDatabase/GetDatabaseQuery.cs

@@ -33,6 +33,7 @@ namespace ModernKeePass.Application.Database.Queries.GetDatabase
                     database.KeyDerivationId = _databaseProxy.KeyDerivationId;
                     database.Size = _databaseProxy.Size;
                     database.IsDirty = _databaseProxy.IsDirty;
+                    database.MaxHistoryCount = _databaseProxy.MaxHistoryCount;
                 }
                 return database;
             }