Add configuration support for Steam?

[katawful]

The automatic integration of metadata and games is really nice. However, I can't hide games I don't want to nor add my own metadata for games that are no longer available on the store. Proton installs on Linux show up as a game and a game like Deus Ex HR original release has no images or metadata at all. Would it be possible to override these two kinds of issues?

[mmatyas]

Adding metadata for Steam is not properly available yet, but I'd like to add support for it. Game info is downloaded directly from Steam at the moment, so it seems if the game gets removed (for whatever reason) Steam no longer provides info about it. That's indeed an interesting case; I wonder, do things work when you try to see the game in Steam's own big picture mode?

I think I can fix the Proton issue though.

[katawful]

I do have the all the appropriate game info for Deus Ex HR in big picture mode, same as every other game

[TiZ-HugLife]

This could be particularly important for Optimus users to be able to select which games they want to run on their nvidia GPU, especially if Steam is installed via Flatpak.