[Feature Request] Ability to start from main menu

[alexandrevicenzi]

This is mainly to allow Kodi from the main menu, not the sublist. Kodi is a standalone app, thus it does not need to show a "game list".

It would be nice to just hit Kodi and start it from the main screen, currently, there's a need to hit the gamepad twice to start Kodi.

With a few changes in SystemView and SystemData this can be done. My suggestion is to add a new optional tag to the xml cfg file, like <standalone>true</standalone> and read it.

This would also be interesting for Steamlink and Firefox/Chrome integration into ES.

I would be happy to send a PR for this change.