[Feature Request] [Linux] Launch game support / Run through Steam

[regalialong]

Explain in detail what your suggested feature would be used for.
VRCX assumes it runs through Windows and wants to directly launch executable of the game. On Linux, Proton handles that environment instead.

Wine should support protocol links so VRCX should call steam://launch/438100 with the appropriate parameters instead so that we don't launch the game in a different environment than Proton, which might not contain relevant fixes and user credentials. It would also be nice to opportunistically enable this if the user appears to be running through Wine.

Describe how it would look if it requires a UI.
Probably just a small toggle like this for the launch options, with VRChat Path Override greyed out or hidden when the toggle is enabled.

Explain why people would want to use it.
To be able to launch the game through VRCX like on a Windows system.