Update master key works

Key file creation works
Code cleanup

WinAppCommon/ViewModels/Items/SettingsSecurityVm.cs

@@ -0,0 +1,43 @@
+using System.Threading.Tasks;
+using GalaSoft.MvvmLight.Messaging;
+using GalaSoft.MvvmLight.Views;
+using MediatR;
+using Messages;
+using Microsoft.Extensions.DependencyInjection;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Application.Database.Commands.UpdateCredentials;
+
+namespace ModernKeePass.ViewModels.ListItems
+{
+    public class SettingsSecurityVm
+    {
+        private readonly IMediator _mediator;
+        private readonly ISettingsProxy _settings;
+        private readonly INavigationService _navigation;
+
+        public SettingsSecurityVm(): this(
+            App.Services.GetRequiredService<IMediator>(), 
+            App.Services.GetRequiredService<ISettingsProxy>(), 
+            App.Services.GetRequiredService<IMessenger>(), 
+            App.Services.GetRequiredService<INavigationService>()) { }
+
+        public SettingsSecurityVm(IMediator mediator, ISettingsProxy settings, IMessenger messenger, INavigationService navigation)
+        {
+            _mediator = mediator;
+            _settings = settings;
+            _navigation = navigation;
+
+            messenger.Register<CredentialsSetMessage>(this, async message => await UpdateDatabaseCredentials(message));
+        }
+
+        public async Task UpdateDatabaseCredentials(CredentialsSetMessage message)
+        {
+            await _mediator.Send(new UpdateCredentialsCommand
+            {
+                KeyFilePath = message.KeyFilePath,
+                Password = message.Password
+            });
+            //TODO: Add Toast
+        }
+    }
+}