Enhancement Request: implement Informatic's butlerd launch options

[JpTiger]

I don't know if this is possible since it's based on an upstream version of Ertego's plugin, but I thought I'd flag it in case it's helpful since it's on the oradmap here: someone seems to have put together a working butler integration to launch games: https://github.com/Informatic/gog-galaxy-itch.io/tree/butlerd-integration

Maybe this can be incorporated into this plugin?