massive UI overhaul:

- user interface can now be toggled between
   - **split view**: classic ChanSort UI with new/ordered and old/full list side-by-side
   - **single-table**: simplified and more intuitive UI, but not quite as powerful
  When you choose to "Modify current list", the single-table view is used by default,
  otherwise the split view. But you can always toggle between them.
- added option to select a color theme. The UI now uses the "Office 2019 Colorful" theme by default,
  the old theme was "Office 2016 Blue".
- improved many keyboard shortcuts (open the drop-down menus to see the shortcuts)
- improved some icons to work better with dark themes

source/ChanSort/SkinPickerForm.Designer.cs

@@ -0,0 +1,117 @@
+namespace ChanSort.Ui
+{
+  partial class SkinPickerForm
+  {
+    /// <summary>
+    /// Required designer variable.
+    /// </summary>
+    private System.ComponentModel.IContainer components = null;
+
+    /// <summary>
+    /// Clean up any resources being used.
+    /// </summary>
+    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+    protected override void Dispose(bool disposing)
+    {
+      if (disposing && (components != null))
+      {
+        components.Dispose();
+      }
+      base.Dispose(disposing);
+    }
+
+    #region Windows Form Designer generated code
+
+    /// <summary>
+    /// Required method for Designer support - do not modify
+    /// the contents of this method with the code editor.
+    /// </summary>
+    private void InitializeComponent()
+    {
+      System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(SkinPickerForm));
+      this.gallery = new DevExpress.XtraBars.Ribbon.GalleryControl();
+      this.galleryControlClient1 = new DevExpress.XtraBars.Ribbon.GalleryControlClient();
+      this.panelControl1 = new DevExpress.XtraEditors.PanelControl();
+      this.btnCancel = new DevExpress.XtraEditors.SimpleButton();
+      this.btnOk = new DevExpress.XtraEditors.SimpleButton();
+      this.btnReset = new DevExpress.XtraEditors.SimpleButton();
+      ((System.ComponentModel.ISupportInitialize)(this.gallery)).BeginInit();
+      this.gallery.SuspendLayout();
+      ((System.ComponentModel.ISupportInitialize)(this.panelControl1)).BeginInit();
+      this.panelControl1.SuspendLayout();
+      this.SuspendLayout();
+      // 
+      // gallery
+      // 
+      resources.ApplyResources(this.gallery, "gallery");
+      this.gallery.Controls.Add(this.galleryControlClient1);
+      // 
+      // 
+      // 
+      this.gallery.Gallery.AllowFilter = false;
+      this.gallery.Gallery.ColumnCount = 8;
+      this.gallery.Gallery.ImageSize = new System.Drawing.Size(48, 48);
+      this.gallery.Gallery.ShowItemText = true;
+      this.gallery.Gallery.ShowScrollBar = DevExpress.XtraBars.Ribbon.Gallery.ShowScrollBar.Auto;
+      this.gallery.Name = "gallery";
+      // 
+      // galleryControlClient1
+      // 
+      resources.ApplyResources(this.galleryControlClient1, "galleryControlClient1");
+      this.galleryControlClient1.GalleryControl = this.gallery;
+      // 
+      // panelControl1
+      // 
+      resources.ApplyResources(this.panelControl1, "panelControl1");
+      this.panelControl1.Controls.Add(this.btnCancel);
+      this.panelControl1.Controls.Add(this.btnOk);
+      this.panelControl1.Controls.Add(this.btnReset);
+      this.panelControl1.Name = "panelControl1";
+      // 
+      // btnCancel
+      // 
+      resources.ApplyResources(this.btnCancel, "btnCancel");
+      this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
+      this.btnCancel.Name = "btnCancel";
+      this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
+      // 
+      // btnOk
+      // 
+      resources.ApplyResources(this.btnOk, "btnOk");
+      this.btnOk.DialogResult = System.Windows.Forms.DialogResult.OK;
+      this.btnOk.Name = "btnOk";
+      this.btnOk.Click += new System.EventHandler(this.btnOk_Click);
+      // 
+      // btnReset
+      // 
+      resources.ApplyResources(this.btnReset, "btnReset");
+      this.btnReset.Name = "btnReset";
+      this.btnReset.Click += new System.EventHandler(this.btnReset_Click);
+      // 
+      // SkinPickerForm
+      // 
+      resources.ApplyResources(this, "$this");
+      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+      this.Controls.Add(this.gallery);
+      this.Controls.Add(this.panelControl1);
+      this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
+      this.Name = "SkinPickerForm";
+      this.Load += new System.EventHandler(this.SkinPicker_Load);
+      ((System.ComponentModel.ISupportInitialize)(this.gallery)).EndInit();
+      this.gallery.ResumeLayout(false);
+      ((System.ComponentModel.ISupportInitialize)(this.panelControl1)).EndInit();
+      this.panelControl1.ResumeLayout(false);
+      this.ResumeLayout(false);
+
+    }
+
+    #endregion
+
+    private DevExpress.XtraBars.Ribbon.GalleryControl gallery;
+    private DevExpress.XtraBars.Ribbon.GalleryControlClient galleryControlClient1;
+    private DevExpress.XtraEditors.PanelControl panelControl1;
+    private DevExpress.XtraEditors.SimpleButton btnCancel;
+    private DevExpress.XtraEditors.SimpleButton btnOk;
+    private DevExpress.XtraEditors.SimpleButton btnReset;
+  }
+}