Add native menu for mac and refactor MainWindow

Source/LibationAvalonia/ViewModels/MainVM.Liberate.cs

@@ -0,0 +1,64 @@
+using ApplicationServices;
+using LibationFileManager;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using DataLayer;
+
+namespace LibationAvalonia.ViewModels
+{
+	partial class MainVM
+	{
+		public void Configure_Liberate() { }
+
+		public void BackupAllBooks()
+		{
+			try
+			{
+				setQueueCollapseState(false);
+
+				Serilog.Log.Logger.Information("Begin backing up all library books");
+
+				ProcessQueue.AddDownloadDecrypt(
+					DbContexts
+					.GetLibrary_Flat_NoTracking()
+					.UnLiberated()
+					);
+			}
+			catch (Exception ex)
+			{
+				Serilog.Log.Logger.Error(ex, "An error occurred while backing up all library books");
+			}
+		}
+
+		public void BackupAllPdfs()
+		{
+			setQueueCollapseState(false);
+			ProcessQueue.AddDownloadPdf(DbContexts.GetLibrary_Flat_NoTracking().Where(lb => lb.Book.UserDefinedItem.PdfStatus is LiberatedStatus.NotLiberated));
+		}
+
+		public async Task ConvertAllToMp3Async()
+		{
+			var result = await MessageBox.Show(MainWindow,
+				"This converts all m4b titles in your library to mp3 files. Original files are not deleted."
+				+ "\r\nFor large libraries this will take a long time and will take up more disk space."
+				+ "\r\n\r\nContinue?"
+				+ "\r\n\r\n(To always download titles as mp3 instead of m4b, go to Settings: Download my books as .MP3 files)",
+				"Convert all M4b => Mp3?",
+				MessageBoxButtons.YesNo,
+				MessageBoxIcon.Warning);
+			if (result == DialogResult.Yes)
+			{
+				setQueueCollapseState(false);
+				ProcessQueue.AddConvertMp3(DbContexts.GetLibrary_Flat_NoTracking().Where(lb => lb.Book.UserDefinedItem.BookStatus is LiberatedStatus.Liberated && lb.Book.ContentType is ContentType.Product));
+			}
+			//Only Queue Liberated books for conversion.  This isn't a perfect filter, but it's better than nothing.
+		}
+
+		private void setQueueCollapseState(bool collapsed)
+		{
+			QueueOpen = !collapsed;
+			Configuration.Instance.SetNonString(!collapsed, nameof(QueueOpen));
+		}
+	}
+}