Wine prefix handling and compatibility with Proton.

[loathingKernel]

This discussion tracks changes and improvement in handling wine, proton and anything related.
This space will be updated as the discussion progresses.

Concerns

1. Per-game prefixes
2. Wine and Proton path compatibility
3. SteamGameId and SteamAppId environment variable resolution
4. [Feature Request] luxtorpeda support #275