[FEAT]: Metacritic score

[algonal9]

Hello! I wanted to congratulate you on the plugin—it's amazing! I use it a lot, but I have a small issue that isn't caused by the plugin itself, but it slightly affects the experience.

I have a tab where I keep my favorite games—the ones I plan to play next—and I have them sorted by their Metacritic score using the option provided by Tabmaster. However, for games that aren't on Steam (for example, games added from Epic), the score doesn't appear, and they all get grouped into the "Everything Else" category.

I wanted to ask, is there any way to manually add the Metacritic score to those games so everything is perfectly organized?

Thanks.