Show usage info for installed compatibility tools

[seeeeew]

It would be nice if ProtonUp-Qt would show which currently installed compatibility tools are used by which games.

This would prevent accidentally removing a version that is still needed and help with changing the game settings to a newer version to allow removing older versions.

Steam stores the compatibility tool selection for all games in ~/.local/share/Steam/appcache/appinfo.vdf, which can probably be parsed easily with vdf.

[DavidoTek]

With 7ca15bf ProtonUp-Qt will show whether a compatibility tool is used or not.

I might add a separate view to show which exact games are using the compatibility tool.

[seeeeew]

Awesome, thanks! The "if" would already be a great help, the "what" would just be an added bonus. 👍

[DavidoTek]

Added dialog to show games using the compatibility tool with b20ca68. Double-click in list to open.