[REQUEST] Add being able to apply Proton\Wine\ProtonGE to downloaded installers

[TesterHere06]

Is your feature request related to a problem? Please describe. Steam Deck requires Proton/Wine/Proton GE to be able to run Windows .exe files, which makes the adding installer to Steam and then launching it there process pretty long. It would be nice being able to launch installers right in the launcher using Proton

Describe the solution you'd like Add being able to right click the game and select Proton version to use while launching the installer/game

Describe alternatives you've considered Adding to Steam directly, going into there, selecting compatibility version and launch it from there

[scrlkx]

We do have the ability to run game installers using Wine/Lutris but is not working properly (#299). There is nothing about running the games though.

[scrlkx]

@gylli251did some progress at #155 where it uses Lutris to run games. It's a good start.

[scrlkx]

I've a open PR that fixes the current implementation of running installer on Linxus using Lutris or Wine. It's a start, but I assume we will need something more flexible to really meet the hole Linux ecosystem, like allow users to select what they to use use to install/launch each game.