Revert "Go back from Webkit to IE render engine"

This reverts commit f58ef0dcb6.

QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/WebkitPanel.xaml.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Windows;
+using System.Windows.Controls;
+using CefSharp;
+
+namespace QuickLook.Plugin.HtmlViewer
+{
+    /// <summary>
+    ///     Interaction logic for UserControl1.xaml
+    /// </summary>
+    public partial class WebkitPanel : UserControl, IDisposable
+    {
+        private readonly string _cefPath =
+            Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
+
+        public WebkitPanel()
+        {
+            var libraryLoader = new CefLibraryHandle(Path.Combine(_cefPath, "libcef.dll"));
+
+            if (!Cef.IsInitialized)
+                Cef.Initialize(new CefSettings
+                {
+                    BrowserSubprocessPath = Path.Combine(_cefPath, "CefSharp.BrowserSubprocess.exe"),
+                    LocalesDirPath = Path.Combine(_cefPath, "locales"),
+                    ResourcesDirPath = _cefPath,
+                    LogSeverity = LogSeverity.Disable,
+                    CefCommandLineArgs = {new KeyValuePair<string, string>("disable-gpu", "1")}
+                });
+
+            InitializeComponent();
+
+            Application.Current.Exit += (sender, e) => Cef.Shutdown();
+
+            browser.RequestHandler = new RequestHandler();
+            browser.MenuHandler = new MenuHandler();
+            browser.JsDialogHandler = new JsDialogHandler();
+        }
+
+        public void Dispose()
+        {
+            browser?.Dispose();
+        }
+
+        public void Navigate(string path)
+        {
+            if (Path.IsPathRooted(path))
+                path = UrlHelper.FilePathToFileUrl(path);
+
+            browser.IsBrowserInitializedChanged += (sender, e) => browser.Load(path);
+        }
+
+        public void LoadHtml(string html, string path)
+        {
+            if (Path.IsPathRooted(path))
+                path = UrlHelper.FilePathToFileUrl(path);
+
+            browser.IsBrowserInitializedChanged += (sender, e) => browser.LoadHtml(html, path);
+        }
+    }
+}