Download art for all non-steam game shortcuts

[idbrii]

This PR also builds on #8 and #9.

This is a pretty big PR and adds a feature I'm pretty excited about: entirely automatic art downloads for all of your non-game shortcuts. It tries to figure out the appid and downloads art from steam. If that fails, there's a way to specify backup art (which the itchio integration does but EGS and Xbox do not).

If you added non-steam games manually (from Origin or something we don't yet support), it will also try to get art for them too.

Here's some before and after with a mix of Steam, EGS, Xbox, and itch games:

Big Picture

Desktop client

* Prey in those screenshots only works because it's special cased to avoid getting it confused with Prey 2006. It's a good example of how this method isn't foolproof, but I think it's effective enough to be worthwhile.

This PR also adds --replace-existing which I found really useful in testing.

Downloading requires the --download-art argument since we'd suddenly download a whole lot of stuff which might be bad? Although my steam grid folder is only 14 MB so maybe it's not that bad. Not sure if you want the defaults to be very minimal or not.

If you run steamsync as admin, it creates symlinks instead of making duplicates of art files. That's not documented, but I'm not sure where I'd put it.

[jaydenmilne]

Final thoughts for merge:

• This is amazing, you are amazing
• Fix the crash when the grid folder doesn't exist
• I think you should add another flag to try and parse every shortcut. LMK if you have strong opinions on this

Let me know if you want to implement any other heuristics I suggested for guessing steamids

[idbrii]

Again, this is on top of #9.

I've fixed the crash, supported abzu, actually checked the version number in the app list, expire the app list after a week, and added a flag for add all art. But I didn't try steam search as an additional fallback.

I renamed my grid folder and tested a sample of games that hit a bunch of the boundary conditions.

Game	Source	images downloaded
ABZU	epicstore	4/4
Control	epicstore	4/4
Rocket League®	epicstore	4/4
What Remains of Edith Fin	epicstore	4/4
Baba Is You	itchio	4/4
Lenna's Inception	itchio	4/4
The King's Bird	itchio	4/4
art of rally	itchio	4/4
Genesis Noir for Windows	xbox	4/4
Ghost of a Tale PC	xbox	4/4
PHOGS!	xbox	4/4
ReCore	xbox	2/4 (old game)
Tetris® Effect: Connected	xbox	0/4 (Appid not found.)

Tetris Effect doesn't work because weirdly the game's appid is listed as "omega": 1003590, in the downloaded json. I swear this worked earlier, so maybe they changed something since it's still not out on Steam yet. I guess ReCore is so old and unpopular that they didn't bother to upload new steam grid art for it.

Then I ran with --download-art-all-shortcuts and it looks good, but I didn't check as closely. (Downloaded new art for 35/37 games!)

[idbrii]

Oh, I also tested downloading art for a UWPHook shortcut (Spiritfarer) and that works well too.

👍🏽