Added dirty behavior

Removed restore action (-> Move action wip)
Added additional check on DB size before auto saving
Code cleanup

ModernKeePass.Application/Common/Behaviors/SetDirtyBehavior.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Application.Database.Commands.CloseDatabase;
+using ModernKeePass.Application.Database.Commands.SaveDatabase;
+
+namespace ModernKeePass.Application.Common.Behaviors
+{
+    public class SetDirtyBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
+    {
+        private readonly List<string> _excludedCommands = new List<string>
+            {nameof(SaveDatabaseCommand), nameof(CloseDatabaseCommand)};
+
+        private readonly IDatabaseProxy _database;
+
+        public SetDirtyBehavior(IDatabaseProxy database)
+        {
+            _database = database;
+        }
+
+        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next)
+        {
+            var response = await next();
+            var queryName = typeof(TRequest).Name;
+            if (queryName.Contains("Command") && !_excludedCommands.Contains(queryName))
+            {
+                _database.IsDirty = true;
+            }
+
+            return response;
+        }
+
+    }
+}