UI - Implemented tray icon

UI - Moved dialog service to the shared UI project
UI - Implemented autorun

src/Artemis.UI/Screens/TrayViewModel.cs

@@ -0,0 +1,67 @@
+using System.Windows;
+using Artemis.Core.Services;
+using Artemis.Core.Services.Interfaces;
+using Artemis.UI.Screens.Splash;
+using Ninject;
+using Stylet;
+
+namespace Artemis.UI.Screens
+{
+    public class TrayViewModel : Screen
+    {
+        private readonly ICoreService _coreService;
+        private readonly IKernel _kernel;
+        private readonly IWindowManager _windowManager;
+
+        public TrayViewModel(IKernel kernel, IWindowManager windowManager, ICoreService coreService, ISettingsService settingsService)
+        {
+            _kernel = kernel;
+            _windowManager = windowManager;
+            _coreService = coreService;
+            CanShowRootViewModel = true;
+
+            var autoRunning = Bootstrapper.StartupArguments.Contains("-autorun");
+            var showOnAutoRun = settingsService.GetSetting("UI.ShowOnStartup", true).Value;
+            if (!autoRunning || showOnAutoRun)
+            {
+                ShowSplashScreen();
+                _coreService.Initialized += (sender, args) => TrayBringToForeground();
+            }
+        }
+
+        public bool CanShowRootViewModel { get; set; }
+
+        public void TrayBringToForeground()
+        {
+            if (!CanShowRootViewModel)
+                return;
+            CanShowRootViewModel = false;
+
+            Execute.OnUIThread(() =>
+            {
+                var rootViewModel = _kernel.Get<RootViewModel>();
+                rootViewModel.Closed += RootViewModelOnClosed;
+                _windowManager.ShowWindow(rootViewModel);
+            });
+        }
+
+        public void TrayExit()
+        {
+            Application.Current.Shutdown();
+        }
+
+        private void ShowSplashScreen()
+        {
+            Execute.OnUIThread(() =>
+            {
+                var splashViewModel = _kernel.Get<SplashViewModel>();
+                _windowManager.ShowWindow(splashViewModel);
+            });
+        }
+
+        private void RootViewModelOnClosed(object sender, CloseEventArgs e)
+        {
+            CanShowRootViewModel = true;
+        }
+    }
+}