Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.Domain/Interfaces/IDialogServiceBase.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Interfaces
+{
+    public interface IDialogServiceBase
+    {
+        Task<string> PickWindowsFolderAsync();
+        Task<byte[]> PickWindowsFileContentAsync(params object[] typeFilters);
+        Task<bool> ShowConfirmationDialogAsync(string question, string title, string confirmationButtonTitle);
+        Task ShowMessageAsync(string message, string title, WinoCustomMessageDialogIcon icon);
+        void InfoBarMessage(string title, string message, InfoBarMessageType messageType);
+        void InfoBarMessage(string title, string message, InfoBarMessageType messageType, string actionButtonText, Action action);
+        void ShowNotSupportedMessage();
+        Task<string> ShowTextInputDialogAsync(string currentInput, string dialogTitle, string dialogDescription, string primaryButtonText);
+        Task<bool> ShowWinoCustomMessageDialogAsync(string title,
+                                            string description,
+                                            string approveButtonText,
+                                            WinoCustomMessageDialogIcon? icon,
+                                            string cancelButtonText = "",
+                                            string dontAskAgainConfigurationKey = "");
+        Task<bool> ShowCustomThemeBuilderDialogAsync();
+    }
+}