Add "Date comfirmed" column in Linux games list

[seeeeew]

I'd love to see when games were confirmed as working on Linux, e. g. to be able to find games that I've owned for years but that only recently added Linux support.

Currently I grep git blame GAMES.json in a clone of the SteamLinux repo and compare the results with a list of my games, which seems like too much work.

[xPaw]

We don't really keep track of when games were confirmed, it would be equal amount of effort to implement this too.

[seeeeew]

Okay, then I'll just automate my current way. ^^

[xPaw]

Went ahead and did it. Set all times to what git blame produced.

[seeeeew]

Thanks, just what I wanted! I think for confirmed games this information is way more useful than the date of the last update. :+1: