Electron: Bundle with server and give user option to use it.

[jfgilliam]

Bundle Electron in the server executable and allow the user to enable it in the settings. Then it will install it automatically and keep it up to date.

[jfgilliam]

This will be available in version https://github.com/SIMRacingApps/SIMRacingApps/releases/tag/Version_1.4_Build_BETA-2017.07.29 or better.

You need to update/add this to your settings.txt file to enable this.

electron-autoupdate = Y