Fix crash due to unkilled WebView2 instances.

MainForm.cs

@@ -3081,6 +3081,7 @@ Things you can try:
                 }
                 else
                 {
+                    if (!Properties.Settings.Default.TrailersOn) { Sideloader.killWebView2(); }
                     RCLONE.killRclone();
                 }
             }
@@ -3095,12 +3096,14 @@ Things you can try:
                 }
                 else
                 {
+                    if (!Properties.Settings.Default.TrailersOn) { Sideloader.killWebView2(); }
                     RCLONE.killRclone();
                     _ = ADB.RunAdbCommandToString("kill-server");
                 }
             }
             else
             {
+                if (!Properties.Settings.Default.TrailersOn) { Sideloader.killWebView2(); }
                 RCLONE.killRclone();
                 _ = ADB.RunAdbCommandToString("kill-server");
             }

Sideloader.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Management;
 using System.Net;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;
@@ -13,6 +14,33 @@ namespace AndroidSideloader
         public static string TempFolder = Path.Combine(Environment.CurrentDirectory, "temp");
         public static string CrashLogPath = "crashlog.txt";
 
+        public static void killWebView2()
+        {
+            var parentProcessId = Process.GetCurrentProcess().Id;
+            var processes = Process.GetProcessesByName("msedgewebview2");
+
+            foreach (var process in processes)
+            {
+                try
+                {
+                    using (ManagementObject obj = new ManagementObject($"win32_process.handle='{process.Id}'"))
+                    {
+                        obj.Get();
+                        var ppid = Convert.ToInt32(obj["ParentProcessId"]);
+
+                        if (ppid == parentProcessId)
+                        {
+                            process.Kill();
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _ = Logger.Log($"Exception occured while attempting to shut down WebView2 with exception message: {ex.Message}", LogLevel.ERROR);
+                }
+            }
+        }
+
         //push user.json to device (required for some devices like oculus quest)
         public static void PushUserJsons()
         {