Exit other application (and steam apps) upon game close

[Kyle Rea]

There is the ability to start a third party application upon the launch of a game in LB or BB, but not the ability to close an app upon that game/app closing. It would be helpful for various keyboard to xinput applications for LaunchBox to be able to close those applications upon game close so the user can seamlessly go from playing say a windows based steam game and back into Mame, using standard keyboard controls being directed via a keyboard or iPac like input.

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Currently this requires a custom AHK, which is even more complicated with steam.