* #396 New feature : match download status to files

* UI: Visible Books \> Set 'Downloaded' status automatically. Visible books. Prompts before saving changes
  * CLI: Full library. No prompt

Source/LibationWinForms/Dialogs/LiberatedStatusBatchManualDialog.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Forms;
+using DataLayer;
+using Dinah.Core;
+using LibationFileManager;
+
+namespace LibationWinForms.Dialogs
+{
+    public partial class LiberatedStatusBatchManualDialog : Form
+    {
+        public LiberatedStatus BookLiberatedStatus { get; private set; }
+
+        public class liberatedComboBoxItem
+        {
+            public LiberatedStatus Status { get; set; }
+            public string Text { get; set; }
+            public override string ToString() => Text;
+        }
+
+        public LiberatedStatusBatchManualDialog()
+        {
+            InitializeComponent();
+            this.SetLibationIcon();
+
+            this.bookLiberatedCb.Items.Add(new liberatedComboBoxItem { Status = LiberatedStatus.Liberated, Text = "Downloaded" });
+            this.bookLiberatedCb.Items.Add(new liberatedComboBoxItem { Status = LiberatedStatus.NotLiberated, Text = "Not Downloaded" });
+
+            this.bookLiberatedCb.SelectedIndex = 0;
+        }
+
+        private void saveBtn_Click(object sender, EventArgs e)
+        {
+            BookLiberatedStatus = ((liberatedComboBoxItem)this.bookLiberatedCb.SelectedItem).Status;
+            this.DialogResult = DialogResult.OK;
+        }
+    }
+}