Added dialog system

Added surface delete

src/Artemis.UI/ViewModels/Dialogs/ConfirmDialogViewModel.cs

@@ -0,0 +1,28 @@
+namespace Artemis.UI.ViewModels.Dialogs
+{
+    public class ConfirmDialogViewModel : DialogViewModelBase
+    {
+        public ConfirmDialogViewModel(string header, string text, string confirmText, string cancelText)
+        {
+            Header = header;
+            Text = text;
+            ConfirmText = confirmText;
+            CancelText = cancelText;
+        }
+
+        public string Header { get; }
+        public string Text { get; }
+        public string ConfirmText { get; }
+        public string CancelText { get; }
+
+        public void Confirm()
+        {
+            Session.Close(true);
+        }
+
+        public void Cancel()
+        {
+            Session.Close(false);
+        }
+    }
+}

src/Artemis.UI/ViewModels/Dialogs/DialogViewModelBase.cs

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+using Artemis.UI.ViewModels.Utilities;
+using MaterialDesignThemes.Wpf;
+using Stylet;
+
+namespace Artemis.UI.ViewModels.Dialogs
+{
+    public abstract class DialogViewModelBase : ValidatingModelBase
+    {
+        protected DialogViewModelBase(IModelValidator validator) : base(validator)
+        {
+        }
+
+        protected DialogViewModelBase()
+        {
+        }
+
+        public DialogViewModelHost DialogViewModelHost { get; set; }
+        public DialogSession Session { get; private set; }
+
+        public void OnDialogOpened(object sender, DialogOpenedEventArgs e)
+        {
+            Session = e.Session;
+        }
+
+        public virtual void OnDialogClosed(object sender, DialogClosingEventArgs e)
+        {
+        }
+    }
+}

src/Artemis.UI/ViewModels/Dialogs/SurfaceCreateViewModel.cs

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+using System.Threading.Tasks;
+using Stylet;
+
+namespace Artemis.UI.ViewModels.Dialogs
+{
+    public class SurfaceCreateViewModel : DialogViewModelBase
+    {
+        public SurfaceCreateViewModel(IModelValidator<SurfaceCreateViewModel> validator) : base(validator)
+        {
+        }
+
+        public string SurfaceName { get; set; }
+
+        public async Task Accept()
+        {
+            await ValidateAsync();
+
+            if (HasErrors)
+                return;
+
+            Session.Close(SurfaceName);
+        }
+
+        public void Cancel()
+        {
+            Session.Close();
+        }
+    }
+}

src/Artemis.UI/ViewModels/Dialogs/SurfaceCreateViewModelValidator.cs

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+using FluentValidation;
+
+namespace Artemis.UI.ViewModels.Dialogs
+{
+    public class SurfaceCreateViewModelValidator : AbstractValidator<SurfaceCreateViewModel>
+    {
+        public SurfaceCreateViewModelValidator()
+        {
+            RuleFor(m => m.SurfaceName).NotEmpty().WithMessage("Layout name may not be empty");
+        }
+    }
+}