Add completion status icons in game list

[OllisJL]

Feature Description

When in details view I would love it if you could see completion status icons like in the eMixedNite and SeaSide themes.

Screenshots

https://gyazo.com/db0a5eb10b78cf936cb4d7d565fd734c

[poetickatana]

I second this suggestion. I would also like an option to display completion status icons under grid view covers, next to time played as seen in this example from Seaside.