Add a Autostart option

[marvin1099]

it would be great if there was a way to auto start a selected game after update or right now if there is no update. Here are some options to implement this:

• have a command line argument for it that way it can easily disabled but enabling is of couse a bit more involved
• just have a checkbox for it (maby have a short start delay of 5 seconds where users can disable the autostart)
  Probably the best option

I don't mind what you do, it would just be great to have it.