[PowerLauncher] Remove unused API

src/modules/launcher/PowerLauncher/PublicAPIInstance.cs

@@ -49,19 +49,6 @@ namespace Wox
             _mainVM.ChangeQueryText(query, requery);
         }
 
-        public void RestartApp()
-        {
-            _mainVM.MainWindowVisibility = Visibility.Hidden;
-
-            // we must manually save
-            // UpdateManager.RestartApp() will call Environment.Exit(0)
-            // which will cause ungraceful exit
-            SaveAppAllSettings();
-
-            // Todo : Implement logic to restart this app.
-            Environment.Exit(0);
-        }
-
         public void CheckForNewUpdate()
         {
             // _settingsVM.UpdateApp();

src/modules/launcher/Wox.Plugin/IPublicAPI.cs

@@ -23,11 +23,6 @@ namespace Wox.Plugin
         /// </param>
         void ChangeQuery(string query, bool requery = false);
 
-        /// <summary>
-        /// Restart Wox
-        /// </summary>
-        void RestartApp();
-
         /// <summary>
         /// Remove user selected history item and refresh/requery
         /// </summary>