Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.Domain/Interfaces/IMailDialogService.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Entities.Shared;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Accounts;
+using Wino.Core.Domain.Models.Folders;
+
+namespace Wino.Core.Domain.Interfaces
+{
+    public interface IMailDialogService : IDialogServiceBase
+    {
+        Task<bool> ShowHardDeleteConfirmationAsync();
+        Task HandleSystemFolderConfigurationDialogAsync(Guid accountId, IFolderService folderService);
+
+        // Custom dialogs
+        Task<IMailItemFolder> ShowMoveMailFolderDialogAsync(List<IMailItemFolder> availableFolders);
+        Task<AccountCreationDialogResult> ShowNewAccountMailProviderDialogAsync(List<IProviderDetail> availableProviders);
+        IAccountCreationDialog GetAccountCreationDialog(MailProviderType type);
+
+        Task<MailAccount> ShowEditAccountDialogAsync(MailAccount account);
+        Task<MailAccount> ShowAccountPickerDialogAsync(List<MailAccount> availableAccounts);
+
+        /// <summary>
+        /// Displays a dialog to the user for reordering accounts.
+        /// </summary>
+        /// <param name="availableAccounts">Available accounts in order.</param>
+        /// <returns>Result model that has dict of AccountId-AccountOrder.</returns>
+        Task ShowAccountReorderDialogAsync(ObservableCollection<IAccountProviderDetailViewModel> availableAccounts);
+
+        /// <summary>
+        /// Presents a dialog to the user for selecting folder.
+        /// </summary>
+        /// <param name="accountId">Account to get folders for.</param>
+        /// <param name="reason">The reason behind the picking operation
+        /// <returns>Selected folder structure. Null if none.</returns>
+        Task<IMailItemFolder> PickFolderAsync(Guid accountId, PickFolderReason reason, IFolderService folderService);
+
+        /// <summary>
+        /// Presents a dialog to the user for signature creation/modification.
+        /// </summary>
+        /// <returns>Signature information. Null if canceled.</returns>
+        Task<AccountSignature> ShowSignatureEditorDialog(AccountSignature signatureModel = null);
+
+        /// <summary>
+        /// Presents a dialog to the user for account alias creation/modification.
+        /// </summary>
+        /// <returns>Created alias model if not canceled.</returns>
+        Task<ICreateAccountAliasDialog> ShowCreateAccountAliasDialogAsync();
+
+    }
+}